The trailer is 26'6", dry weight is 4800 but with the options it sits at 5240. I'd venture it'll be somewhere around 5600 once we load it.
Once you load it you will be closer to 6200...Trust me. Almost impossible to have less than 800 lbs. of stuff, not 360 lbs.. I would figure on 1000 lbs.
Remember you have RV necessities such as: power cords, wheel chokes, Lynx-levelers, sewer hoses, water hoses, cable line, Surge protector, blooms, campfire chairs, small table, lawn mat, patio lights, tools, small vacuum, small ax & hammer, the 6 gallons of water that stays in your water heater.
Inside you have: pot & pans, silverware, cutting board, paper goods / alum-foil, clothes, jackets, shoes, towels, boxed and canned food, beverages / pop / beer/ bottled water, TV, carpets, toiletries, toilet chemicals , bedding, pillows, blankets...
Optional stuff: bikes, kids toys, firewood, people (you have to count-um) even your equal-i-zer W-D hitch counts towards your weight.
The 06' Toyota Sequoia only has the 4.7L v-8. I had the 05' Toyota 4Runner ( smaller SUV ) with the same 4.7L V-8. It was rated at 7200, but I was pulling at 25' tt (5100 / 5200 lbs wet). I would not have bought anything larger. That is why I upgraded to a 5.7L Tundra.
I think you will be OK towing with the longer wheel-base Sequoia, unless your pulling in the mountains a lot. Just have to really watch your weight. We had 9 good years using the 05' 4Runner towing both a 3900 lb. (dry) and a 4300 lb. (dry) tt.