We haul large horse trailers (40')all over the country taking clients and their horses to shows, It seems to be a chevrolet and a ford world. a few dodges for those that don't mind driving a manual. It seems they all have there lemons. Back to the original question GMC or Tundra I think it depends on what you are gonna use it for.

Stam, Your post states you carried a 2500lb camper and towed a 20' sled was that with a toyota? if so WOW!!!
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see ya on the water.