Groover wrote:
Probably the new Ford Transit. When it was designed to replace the Econoline series the emphasis was shifted to interior comfort, convenience, fuel economy and weight carrying at the expense of the bulky and heavy frame needed for trailer pulling. For 2020 the passenger version of the van carried a maximum tow rating of 4,500lbs where the old E350 was rated for 9,900lbs.
It actually appears that the Transit is only offered in RWD (and new for the 2020MY) and AWD. I didn’t take any more time to check but it would be interesting if you can get the advertised 7500# towing and AWD. If so, sounds like that could be a contender for the OP.
Maybe the 3/4 ton vans are the Transit Connect, the City Express and similar vans that have 1500# (3/4 ton) of payload?