I was wandering if someone could tell me what gas mileage I could expect if I put a Lance 850 on a 2015 Silverado 2500 6.0 4:10 rear end and if you all think that this truck could handle this size camper? Sticker on truck says it will haul just under 3000 lbs. Was thinking I might get better mileage hauling the camper than pulling a small TT. If anyone has a Silverado with a 6.0 and hauls a truck camper I would like to know what mileage I might expect. Thanks if you can help me.