Dually on E350: 2500 extra pounds is a lot.
Dually on that F250: Not an option it looks like according to this
https://www.fordf150.net/2007/2007-ford-f250-superduty-specifications.php
Now that I think about it, maybe a 5th wheel is an option after all if I use an extended F-350 pickup, since they have much bigger payload, but only with dually since no other setup can pull the massive Jayco 325bhqs (GVWR 13,750):
https://www.fordf150.net/2007/2007-ford-f250-superduty-specifications.php
P.S. I think I'd also need 6.8L 4.30:1, stretched crew cab.
