Join Date: Dec 2011
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My camper is roughly 7500lbs. I don't have a bit of trouble with it and I don't have a supercharger. I got 11.5mpg my last trip and that was with some hills. Have you weighed your trailer? 3k is a lot of additional weight since you said 7500 dry and 10.5k loaded. Mine is 6310 dry and around 7500+ loaded not including water which I never fill up, and that's with about anything you'd ever need to camp with.
2011 Tundra CM 4x4 TRD Offroad, SR5, Spruce Mica, Zone 3/1 lift, 20x9 XD Black Hoss, 305/55/20 Nitto Terra Grappler, TRD Skidplate, Sunroof, Cold Weather Package, Deck Rail System, etc...
Clarion NX501 NAV/DVD, 2 RE Audio SRX 10's in a custom vented box, HiFonics Brutus 1200.1, Stinger capacitor, 6K 35W HIDs in Fogs, and Low Beams, Plasmaglow Fire and Ice Light Bar, Rhino Liner Hardline, Tri-Fold Bedcover