Generally, a bad idea. If the truck is level when towing now, it will sag in the rear when the 5th wheel is hitched up after you install a leveling kit, and the headlights will be pointing to the sky (and into other drivers' faces). You'll also add caster as the rear squats lower - excessive (as well as insufficient) caster can cause caster wobble, also known as "death wobble".
Rusty
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