I have LL Shocks and no tow package. I'm pretty sure most Altitudes have LL's. Easiest way to find out is crawl under you rig and get the part number on the shock body. That's what I did.
LL part# 68039660AA
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2015 Altitude - Billet Silver
SRT Springs, Taillight Bezels, Red Start Button, Pedals & Grille Mesh, Black Lugs,
Mopar 4" Chrome exhaust tips, 1.25" Bora Wheel Spacers, DDM 5500k HID,
Red LED 3157 Bulbs, 15% Tint, Polk DB Center Channel, Mopar All Weather Mats