Before we bought the motor home I was towing a 20 foot TrailManor TT that weight about 4,100 pounds loaded and wet. I started out towing it with a 2002 Chevy 1500HD. This is a crew cab truck with a 6.5 foot bed. I had no problems towing.
Then I got a 2008 GMC 2500HD long bed. It was so much nicer to use as a tow vehicle. I did not tow with a WD hitch for either truck. Under some road conditions I was getting a little bit of bouncing bronco effect. This went away when I switched to the longer wheelbase. The built in brake controller worked so much better than a Prodigy.
If I was going to tow again this is how I would select a tow vehicle.
1. make sure the load carrying capacities are at least adequate.
2. I would require a built in brake controller.
3. I would get the longest wheelbase I could find.
I was towing 180 miles each way, sometimes in heavy commute traffic. Then maximum speed limit while towing is 55 mph. We camped about once a month during Spring, Summer, and Fall. If I was only towing shorter distances then I might relax some of my requirements.
If your wheelbase is too short relative to the length of the TT then you will encounter the "tail wagging the dog" effect. I did not notice this with the shorter wheelbase 1500HD. In my experience the wheelbase of the 1500HD is more than adequate. I have no experience towing with anything that has a shorter wheelbase than that. I doubt that I would want to.
I prefer gas over diesel unless at least one of the following criteria are met:
1. frequently towing above 8,000 feet.
2. towing at least 15,000 miles per year, year after year.
3. towing heavy, but I have no definition of heavy, other than 4,100 pounds is not heavy.
Somewhere I have read about a rule of thumb for wheelbase. I THINK it is that the TV wheelbase should be at least 1/3 of the wheelbase of the trailer you are towing. Perhaps someone else has access to that rule of thumb.
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Wayne in Coarsegold near Yosemite
2013 Forest River Solera 24R
2014 Jeep Wrangler Rubicon
ATV trailer for the following toys
2008 Yamaha WR250R,2009 Honda CRF150F
2008 Polaris Scrambler 500
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