What SUV's will tow Jayco Jay Flight 32TSBH or Eagle 324BTS

I spoke with a 4x4 shop today that does almost all van work and they said two things.

1. The E-350 reconfigured with a larger hitch is not something they would do for liability reasons.

2. The E-450 (which they do a ton of as well), does not have the best back-end for towing heavy stuff like this, due to the way they sit, etc...