I took a closer look at the Michelin's on my Expy and it appears they are only "P" rated passenger car tires, so I'm going to forego the "E" and just stick a set of stock size "LT" tires on it for now (probably Nitto Terra Grapplers, I have had really good look with those). I'm also going to try those helper spring from etrailer.com and see if they will help eliminate some of the sagging.