so i plan on buying a new truck and i decided between a h1 i plan to swap this engine for a 6.6 durmax or a gmc sierra 2500 - 3500 .the truck will be mainly used for towing my boat through some ruff turrain a bit of offroadingand driving through a canadian winter. so my question is which one of these would be better for my situation

 

I assume that your boat trailer can make it where the Hummer goes? You could easily pull a fishing boat behind the H1 or the GMC truck