My BIL went from 6.0L PSD powered E350s to 6.8L V10 powered E350s in his ambulance service because he got tired of the tens of thousands he had to dump into the diesels to keep them running. The gassers are slower, but they don't break down weekly like the diesels did.
Buy a 1/2ton truck and swap in a voltswagon TDI, 1.8liter diesel making about 100hp and close to 250lbs of torque haha
Currently you get Japanese sourced"Midsizers" all roughly 9/10ths the size of a F150, with 350-405lbs ft of torque. Horsepower 220-240hp, from 3 Litre diesel 2500lb payload with the Pickup body.
Towing being up rated to 7300-7700lbs. Put that in perspective a 2011 Chevrolet Silverado 2500HD diesel is rated at 9,900lbs in Australia.