There are times when we take along our Yamaha side X side so we have to pull the trailer. But I still would much rather have just the truck and TC. Love the maneuverability without having to pull along a trailer. The best I can figure is about a 1 mpg difference with the trailer.
2009 Silverado 3500 dually D/A, Supersprings, Stable Loads, Bilsteins, Hellwig Sway Bar.
2010 Arctic Fox 1140 DB, 220 watts solar, custom 4 in 1 "U" shaped dinette/couch, baseboard and Cat 3 heat, 2nd dinette TV, cabover headboard storage, 67 TC mods