Our Phoenix Cruiser is built on a 2007 E350-V10 cut-away chassis. Because the loaded house with all our gear & fresh water placed so much weight on and behind the rear axle, the front was slightly lifted. That lighter front had the front wheels at a slight inward angle like this.
Our rig when new didn't handle very well so I took the rig to a specialty truck/bus/RV/ambulance shop of which they did a number of upgrades. For the wheel alignment, the camber adjustment required more than the suspension allowed so they installed offset camber bushings that resemble this.
I understand the 2008-2014 E350 & E450 have less of a problem, but it all depends on the weight distribution of your motor home. You have to consider the weight of your fresh water and gear. That is why the shop had us load the rig ready for a trip, gear, water, gasoline, and propane....as close as you can get to represent "actual" loaded conditions. I even threw in some exercise weights placed right behind the driver and passenger seats. Then it was ready for an alignment.
