I have a 2008 Tundra DC 4x4 5.7L (Timbrens, Deaver AAL, 275/70/18 E-rated tires) with a Shadow Cruiser pop-up.
On one trip through about 7 Rocky Mtn states (so we had EVERYTHING) including my family, gas, etc, we weighed 7950lbs. The rear may have been a little over the (P-tire rated) axle...