I picked up an 05 double cab last year. I really like the truck, very comfortable, and my growing kids needed a bigger back seat. We were towing a single axle small travel trailer with our 80 Series and T100, (about 4000+ pounds loaded) but I wanted a newer stronger tow vehicle. Then we we bumped up to the next bigger trailer this spring. Trailer manufacturers are such liars when it comes to weights. Trailer is nearly 800 pounds heavier than advertised dry weight, and only normal gear in it, came in at 5040 pounds, then fill up the 50 gallon fresh water tank (425 pounds), cause we are always boondocking and things got heavy real quick.
We did 3000 miles this summer from NW CO to northern California redwoods, up the 101 on the Oregon coast, across WA to Seattle and back to NW CO. Overall the truck pulled great, did fine on the highway and interstate, but the tongue weight was horrid. I used an Andersen WDH, not known for completely lifting a heavy tongue, but they are light and convenient. Never had any sway issues, but we had unnaturally calm winds the entire trip too. I just didn't like the rear end squat that I could not get rid off. Camped over labor day with the same trailer, little less gear, but full water and 400 pounds of ATV in the truck and she was on the bumpstops the whole time, even with hitch dialed up.
I had to put airbags on the 80 and T100, so I guess I will have to do that to the Tundra too. They do stiffen the ride, didn't really want to do it, but I think they would work best, especially when I take my 4wheeler with us. You can see the squat in the pics below. I think towing a stockish 40, short distances on a light trailer is very doable. Also remember, the regular cab was rated at 7000+ plus pounds towing, the Access Cab is less, and the Double Cab is derated clear down to 6700 pounds because of the larger truck and keeping the GVWR about the same across the 1st gen line.
Some pics, we all like pics, 80 in Yellowstone a couple years ago, heavy loaded T100 for a month long hunting trip and the Tundra with new trailer.
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