Guess we're lucky. 4400 miles and still driving straight, handling good, and sooooo much better than a F53 chassis. Air bags are definitely worth it. If you want to go all out, do the full air ride suspension. Several companies out there that do it for the E-450. I was considering, but not worth the money for the amount of time we keep a unit.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.