Bob, you don't mention in this thread what you are trying to correct. If you are considering lifting the rear end, consider replacing the rear spring pack with a Ford Heavy Duty pack or equivalent, vs helper springs or air bags. My receiver center is 12" above the ground and my rear end is overweight and raising the rear end will shift some weight to the front axle---I'm told. Do this before a wheel alignment.
A rear Track Bar will HELP with 18 wheelers moving you when they pass.
And I PM'd you,.
2014 Nexus Viper 29V Class B+ nicely customized
downsized from a Class A 2008 Allegro Bay 35TSB with 78k miles
Towed is 2007 Ranger with shell