We tow a double axle open car trailer with a 3,450 LB Camaro. Weight combined trailer/car/spares is 5,500 LB. Fully loaded GCVW is around 18,500 LB, Vegas only is around 12,800 LBs. with our stuff, tools and racecar stuff.
The Vegas is an e450 with 6 speed trans.
Since new, average is between 9 and 11 MPG, whether towing/generator or not. Worst recorded was 8.5 running some over 80 MPH on shakedown trip.
I also carry full spare tire and associated stuff in RV. Keep spare water pump and assorted stuff for travel.
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