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It's too bad that some of the lighter 5vers have pretty heavy hitch weights. That turns out to be (in most cases) the biggest single factor in limiting the fifth wheel that a Tundra can tow. I'm surprised that something as small as a 23 ft trailer would have a hitch weight so heavy that it would overload the truck. Unless of course, you're really loading the truck, or the front end of the trailer. The Iforce SR5 DC has a rated 1680 lbs of payload. I did some rough estimates about the loading of the truck and the weight distribution of that weight, and concluded that the tires and axles (using the ratings given) will reasonably support a load of about 2500 lbs in the bed of the truck. It will take an actual measurement on scales with truck fully loaded to really tie the number down, as weight distribution is all important. It seems that the weak link in the chain is the rear springs, built for comfort, not to carry a heavy load.
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