FWIW I've personally towed 7500lbs with the Tundra 5.7 and it was excellent. I'd have no problem pulling that load across the country. Furthermore, it easily out accelerated any of the Diesel HD's with that same load in tow. Our crew cab model had a 10,200lb towing capacity.

Not to mention it costs much less than the HDs, brakes much better, and gets far better fuel economy of even the Diesels.

Jake