That's a lot to consider. Maybe upgrade to a diesel?? Just a thought. Not sure what diesel prices are like by you. Get decent fuel economy (better than V8 anyway) and still be able to haul just about anything.
Maybe check out Frontier from Nissan. I've got an 04 and though its only got a 4 banger in it I can haul a bed load of split wood with little issues. Never towed anything with it though. I would imagine a V6 Frontier (SL trim) with 4x4 and towing package would get the job done. Of course with any towing, it would be at the expense of fuel economy.
18.5" OTS, 22.5" OTG, CB Silver(Rip), Vintage Coleman Bullet, Pit Barrel, UDS