I have a 06 F150 4.6 V8 and haul a 19 foot gambler. Good thing is it hauls great, bad thing is it has blew a plug off the head and i just replaced the rear end total $3000 in repairs. I would go with the Toyota. Ive owned a Dodge V8 as well and it had tranny problems twice and very crappy gas mileage (14mpg at best). My brother has a Silverado V8 and at 80,000 had the tranny replaced but it also hauled great. The Toyotas are known for being reliable as my next truck will be a Tundra.

Shawn