I would agree with APT. Sounds like you want a dedicated tow vehicle. Gas mileage for 1/2 ton vs 3/4 will be the same while towing. The only reason to consider a 1/2 ton is they may have a softer car like ride when not towing.
However that same softer suspension and chassis becomes a liability when towing.
Trying to find a older 1/2 ton gasser equipped for towing is a tall order.
If you plan to use the vehicle mainly for towing,why fool around with the 1/2 ton search when lots of capable 3/4 tons a readily available.
