Re: Airing down tires on 20 inch wheels
I take my 20's down to 18-20 psi for offroading, either snow or sand, never had a problem, obviously if you then hit a road you have to go slower than in usual in order not to damage the wheel, best thing is to have a compressor handy to air up as soon as possible.
In my case my compressor comes always along as its part of the train horn, I installed a "T" so I can always pump air just by connectintg a hose.
Rgds and have fun.
Grand Cherokee 2014 Limited - Mods so far : K&N Air intake system - Weathertec mats - Train Horn - Black Summit Grille - Sill Door Guards - Fog (Bulb) Lights