For us the e350 based 24.1 would be to tight on weight. Fully loaded for track with spares and lots of water we have been very close to 19,000 combined. The trailer is at 5500, RV at 13,500.
Assume there is a degree of safety margin designed in but I do feel more comfortable being under ratings. Came through Smokies on 6 % grade without issues.
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