The most important data for buyers should probably be what Ford rates the chassis to haul or tow. For the new E-Series there is some GCWR overlap between the E-350 and E-450 depending on whether one gets the “Economy” or “Premium” versión of the 7.3L V8 engine. It’s now possible to have an E-350 with Premium engine with higher GCWR than an E-450 with Economy engine.
I can just see irate motorhome buyers who may get less than they expected if manufacturers order some E-450s with Economy engines.
Think about it, a fully-loaded E-450 could end up with only 4,000 pounds of towing capacity (18,000 GCWR - 14,000 GVWR).