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  #181  
Old 09-07-2014, 09:11 PM
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Re: Towing thread

Helped a freind move about 200 miles this weekend with a 6x12 tandem axle U-Haul. 13.8 mpg. I tow my 3500 lb TrailManor camper about 5 mph faster and get 17-18. Only real difference is the drag area of the camper is about the same as the Jeep and the UHaul is A Lot more.

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  #182  
Old 01-02-2015, 04:13 PM
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Re: Towing thread

I tow my Wrangler to and from the trails. Trailer weighs #1620 and the Jeep is #3900. Total of #5520.

Really impressed with the towing capabilities of my '11 5.7L. Plenty of power in the hills, great control, and the auto leveling is sweet.

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  #183  
Old 01-04-2015, 12:08 AM
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Re: Towing thread

For those with the QL, do you set the WD hitch at "sport" mode? Any issues when the vehicle changes height back to normal at low speed?
I'm looking to get a 6000 pounds trailer in the next year or so.
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  #184  
Old 01-04-2015, 02:35 AM
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Re: Towing thread

Quote:
Originally Posted by The Evil Twin View Post
For those with the QL, do you set the WD hitch at "sport" mode? Any issues when the vehicle changes height back to normal at low speed?
I'm looking to get a 6000 pounds trailer in the next year or so.
I run with a 4" drop on the ball mount for my 5000 lb boat with no problems. I normally tow with eco mode off. No problems with the QL.
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  #185  
Old 01-04-2015, 09:44 AM
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Re: Towing thread

Quote:
Originally Posted by Shannon View Post
I run with a 4" drop on the ball mount for my 5000 lb boat with no problems. I normally tow with eco mode off. No problems with the QL.
You use a weight distributing hitch for that? I'm talking about setting the tension on the spring bars for a weight distributing hitch.
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  #186  
Old 01-04-2015, 12:49 PM
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Re: Towing thread

Quote:
Originally Posted by The Evil Twin View Post
You use a weight distributing hitch for that? I'm talking about setting the tension on the spring bars for a weight distributing hitch.
Nope.
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  #187  
Old 01-04-2015, 01:37 PM
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Re: Towing thread

Quote:
Originally Posted by Shannon View Post
Nope.
Gotcha. I was wondering
I'm going to be upgrading from a low boy race trailer to a Toy Hauler (hopefully soon) and it will require a weight distributing hitch at 6790 GTW/ 420 tongue (empty).
Sometime around March I plan on renting one to see how much I like it and how it tows. Just wondering if the spring bars have enough tension on them at the normal ride height for speeds below 55 or if folks set it to sport mode at those times
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  #188  
Old 01-04-2015, 03:30 PM
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Re: Towing thread

I use Normal mode for towing, not Sport mode.
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  #189  
Old 01-05-2015, 02:29 AM
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Re: Towing thread

Quote:
Originally Posted by The Evil Twin View Post
Gotcha. I was wondering
I'm going to be upgrading from a low boy race trailer to a Toy Hauler (hopefully soon) and it will require a weight distributing hitch at 6790 GTW/ 420 tongue (empty).
Sometime around March I plan on renting one to see how much I like it and how it tows. Just wondering if the spring bars have enough tension on them at the normal ride height for speeds below 55 or if folks set it to sport mode at those times
Thats a lot of weight to tow. If you are at 6790 sitting empty, and you add 300 lbs plus for passengers, you will be sitting close to (or even over) your tow max. If you load the trailer, I'm sure you will be way over the limit. Also, your tongue should be 10% of trailer weight - if you don't have enough tongue weight, the trailer will sway side to side when you get up to highway speeds. Sport mode only keeps it in lower gear for a longer period before it upshifts. I normally to in normal drive mode like Jim does.
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  #190  
Old 01-05-2015, 11:27 AM
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Re: Towing thread

Maybe I am being misunderstood.

GTW is Gross Trailer Weight. The maximum allowable weight of the trailer including gear/ provisions/ etc. So I wouldn't be at the max tow rating even if I had the thing loaded to the gills.
The particular model has a GTW of 6790.
Max tongue weight would be in the 550-650 range
UNLOADED (empty) curb weight is 3600
UNLOADED (empty) tongue weight is 420. Toy haulers are usually nose heavy when empty.

I estimate ACTUAL trailer weight, as I will use it, to be in the 5000- 5500 and tongue weight to be about 450- 500. Obviously if there are 2 bikes in the back it will be a tad less and if there are no bikes in the back it will be a tad more. Anywhere between 8-10% of the total weight is fine. I understand weight distribution and the effects of loading on handling.

Weight distributing hitches require the spring bars to be set with the appropriate tension. Vehicles like the CG with QL are typically set up while in "Sport" mode so that the spring bar tension is correct at highway speeds once the vehicle settles in to Aero mode. If the tension was set at normal/ city/ standard ride height, then it will change on the highway as the GC lowers to Aero mode. Conversely, if the tension is set (as it should be) at Aero ride height, the tension will change when the GC is in the Normal mode at lower speeds. You could be driving 50 mph at Normal ride height. Changing the selector to "Sport" at these speeds would lower the ride height to where it was when spring bar tension was set.
So back to my question for those towing with a QL equipped GC using a WD hitch. Ignoring capacity, TW, GTW, GVWR, etc.:
Is the spring bar tension affected enough that it ever warrants a change to "Sport" mode when not at highway speeds?
Cross winds or bow waves an issue?
Is the change in tension nominal and you don't notice?
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  #191  
Old 01-05-2015, 03:16 PM
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Re: Towing thread

For MY11-13, does the JGC even drop into Aero when Tow/Haul is selected? If so, it shouldn't be an issue. That said, I'd be very surprised if the very slight lowering for Aero would matter much at all. It doesn't change the front/rear balance of the JGC and the WDH is just shifting more weight to the front to keep the normal balance from being upset by tongue weights over 350 lbs. What am I missing here?
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  #192  
Old 01-05-2015, 05:44 PM
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Re: Towing thread

Quote:
Originally Posted by Jim_in_PA View Post
For MY11-13, does the JGC even drop into Aero when Tow/Haul is selected? If so, it shouldn't be an issue.
That, sir, is a good question! I honestly do not know. Never thought about it. I'll have to try it on next time I drive it!
Quote:
Originally Posted by Jim_in_PA View Post
It doesn't change the front/rear balance of the JGC and the WDH is just shifting more weight to the front to keep the normal balance from being upset by tongue weights over 350 lbs. What am I missing here?
No, it doesn't change the balance but it changes the ride height. In turn that will change the angle of the spring bars in relation to the ball and decrease tension on them.
edit:
Got some info from ETrailer.com:
Quote:
I spoke with our contact at Reese who suggested that the best way to use the weight distribution system and an automatic leveling or active suspension system at the same time is to first start your vehicle and put a slight load on the rear of the vehicle to let the air suspension begin to level the vehicle. Not all of the tongue weight should be on the truck. Then you will want to measure the distance from the ground to the top of the front wheel wells. Disable the suspension. Next you will want to hitch up your trailer and set up your weight distribution system according to the the instructions that came with it. Finally, you will want measure the height of the front wheel well above the ground again.

As long as that distance has gone down any where from a quarter of an inch to roughly a half an inch, you should be properly set up for hauling that trailer. You will need to observe that measurement decreasing as confirmation that weight is being put on the front axles. It might need to be adjusted a second time.

After you set up your trailer like this once, you will be able to just hitch up and go from there on out. If you were to pull a different trailer or haul a different amount of weight in this trailer you would have to repeat the steps above to achieve the appropriate set up.

The affect of an active system is nominal once properly set up. When hitting bumps or dips on the road the suspension will move much more than an active suspension will. Even under those conditions the chains are not loose and there is still tension on the bars.

For a short wheelbase vehicle towing a longer trailer, I recommend a hitch with sway control. The added cost is nominal for the peace of mind. For your Grand Cherokee I would recommend the RP66153
https://www.etrailer.com/p-RP66153.html

The tongue weight rating covers the entire range of what you could be towing weight wise. It also provides a good deal of ground clearance. If you have any other questions please let us know.
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