[speeder]

A modern diesel HD PU truck, (3/4 ton or more), is the gold standard for towing any large/heavy trailer. Also the most fuel efficient, if you tow a lot.

Rfuerst is right that you cannot beat a dually for towing but it's not needed at all for the OP's needs. They are awesome but overkill for anything lighter than ~8k lbs. and a real biotch to park and manuever in city traffic, plus significant added maintenance costs with (6) 10-ply tires, rear brakes, etc... I'd love to have one but they really are only great if you live in a rural area and tow heavy a lot.