I think I read quite a while ago that Ford had some problem - with emissions certification, I think- on the E-350s and so stopped supplying them for a while. Manufacturers had to use the 450 even where they might normally have used the 350. Apparently Ford is shipping 350s again and they are being used on some of the smaller coaches. My 2017 26HE is on the 450 and while I'm glad it is we have well over a ton of "extra" load capacity even when fully loaded.
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