700 lbs is a bit heavy for a 2619, I think
Even if you're targeting 15% tongue weight, 700 lbs on the tongue would imply a total 2619 weight of over 4600 lbs. There is one reason why this could make good sense:
The tires, and the axle, are rated at about 3500 lbs. So if you're gonna run REALLY HEAVY, then you need to put more weight on the TV (via the tongue). The WDH will put some of the tongue weight (roughly 1/3, it depends on wheelbase and overhang lengths versus the TM) back on the TM, but most of it (the other 2/3) goes forwards onto the TV axles.
Fresh water weighs (IIRC) about 10 lbs per gallon. With a 20 gallon (standard) tank, 200 lbs is quite a load, and it's quite a ways forward of the 2619. I've got a 40 gallon tank, if/when I travel filled up that's a huge load. (Although I might be needing to travel filled-up for genuine boondocking in the future.)
But why travel at the limits of the tires, if you don't have to?
If your destination has a water supply, avoid this weight by filling the water tank when you get there. (Good for the tires, good for gas mileage too.) If you're hesitant because of water quality, you can buy pretty decent carbon filter... and/or carry just a couple of gallons for DRINKING from your home RO system. (This is an issue where I live: mercury-laden mine tailings are everywhere.) Store drinking jugs on the 'curb' side, to help balance weight of the factory-tank on the 'street' side (if filled full or partial). I shove 'em under the seat, next to the heater.
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TM='06 2619 w/5K axle, 15" Maxxis "E" tires. Plumbing protector. 630 watts solar. 450AH LiFePO4 batteries, 3500 watt inverter. CR-1110 E-F/S fridge (compressor).
TV = 2007 4runner sport, with a 36 volt "power boost".
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