Chaser, maybe if going to a local campground, maybe less than 50 miles.
Dinghy YES, Just for the companionship of your spouse or special person. Enjoying the sights, time together in different vehicles?
Hitch weight, not an issue, our hitch weight is actually less with the toad connected, part of the tow bar weight is on the front of the toad. With out the toad 100% of the tow bar is on the MH receiver (tow bar is on MH all the time). Tow ratings for the newer E450s are 7500lbs and most are 5000lbs so that might become a factor in the CGVWR.
Ken