Roy,
I've weighed in at 8200 on a SOLO trip once
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So, they actually start out at 5800 "curb wt". It's the full ladder frame plus unibody mish-mash that makes it so heavy but also very solid and stiff. No matter if it's on two wheels diagonally teetering, the doors just gently shut like it's in the driveway. Nothing moves on the body shell. Apparently a shop can take the body compartment off the chassis/engine/trans in a few hours during one day.
RTT and rack as you see, 2 awnings and their side walls, 2-3 bikes, 40L fridge full, recovery gear, those 2 green waffle boards on the roof, camping stuff, bike tools, car tools, photo gear, and when fueled up, 52 gallons underneath and 4 g water. 2 Odyssey batteries under the hood (1350 and 2150 so fairly heavy) On board air tank supplied by compressor under bonnet. That's all I can think of.
The BFG on that trip on those wheels weight roughly 100 lbs more than the Michelins.
Then there's all the heavy bits below the floor level. Both steel bumpers, winch, sliders (100 lbs each), aluminum engine/steering and transmission plating.
Since that trip I removed the 3rd row seats (80lbs) and left side outboard 2nd row seat (ARB fridge sits in the emptied 2nd row middle seat slot)
As for rolling 6th with 33's.... in the Micheling I think it would not even be noticed. In a 33" BFG, maybe but I take it slow to cruising speed. It almost seems like with the 32's, the gearing is in a better spot at 70-80 than when it was on smaller tires. The engine specs about 300 hp/325 lb-ft but I don't know what rpm the best torque range sits.