They take all the weight off the truck suspension with the lifts when they work on your alignment, so I don't think it matters. Be sure you can fit into the shop door, and also be sure there is room inside for your lifted vehicle too.
Also, be aware that they will take it for a drive after it is done. Would you want your camper on or off when an inexperienced RV driver might be driving it?
Mike
2012 Winnebago Impulse Silver 26QP
2005 16.6 Double Eagle
2018 Jeep Wrangler JK
previously Snowbird Campers,
Triple E Motorhome and Fifth Wheel