I had a 1998 Bigfoot 9.6 on a 1994 Dodge 2500 V10. The sticker weight was 2400 lbs, but on the scale immediately after delivery it weighed 2800 lbs. After a few trips I decided it was too much for the 2500 without some serious upgrades, so I upgraded to an F350 Dually 7.3L, which turned out to be more than adequate. The sticker on my current Bigfoot 10.4 says 3000 but it weighs 3400. The sticker on my Bigfoot 5th wheel said 3800 but it weighed 4400. The only thing you know for sure is, it doesn't weigh LESS than what it says.
I think Bigfoot are the best constructed campers anywhere, though admittedly it is a very low bar.