Lance does have a pretty decent reputation (unlike Palomino--that is probably overpriced for one of those) but they make so darn many campers they have to put out a few lemons. If you buy a Lance, make sure it's not the one featured on that website.
I have an 8 ft floor + extended cabover popup camper (~2200 lbs) on a SRW f350 and it drops highway mileage from ~21 mpg to ~16. I think the Palomino is wider than my Northstar, but has a shorter cabover bed. Between those two, I'd take the Lance. Or keep looking. If you're looking in CO, you ought to have a better selection! Even the Hallmark Mfg.'s used camper selection is priced better than what you're looking at. Even the one they are apparently trying to give away. Okay, maybe not the free one.