Hey all, quick question: I'm aiming to get a 4" lift and go up to 36" tires on 20" rims. I also tow a travel trailer (~3800lb dry weight) and wanted advice from anyone who went this route. The issue is right now, even with the use of a WDH, there is some rear sag and the RV dealer said he doesn't like the way RAMs sag compared to other makes. So...any advice on the type of lift and company providing the kit (I was going to go with Rough Country 4" uniball suspension lift kit but started reading some bad things about this kit, and it cannot be used with air ride suspension), and with this in mind, what modification I can do to prevent the tendency to sag with tow loads once the lift is done? Thanks in advance for any an all advice...