I cannot tell you a "usually"... but my Cyclone 3210 showed up at 12,660# and pin at 21%
Added to the brochure was the genset, 12 gallons gasoline, 60# propane, full HWH, 1/3 tank fresh water, my tools, and luggage for 5. This weekend I'm guessing my wife moved another 1000# out of our old rig and I'd guess we will add another 1000# of stuff before we ever think about hauling a "toy". Good news is that it still has plenty of capacity to haul more -- bad news is that it's more than my truck tires are rated to do.
So yes... TH's come with a weight penalty. Still I like having an extra axle back there and that nice big garage for stuff! (that's why we bought it)