Why not new Toyota OEM 99 'talls'? I think Toyota OEM are stout.
My runner has nearly 307K miles with original springs and I've loaded 800+ lbs in the rear compartment, it 'sags' only 1", that's a stout spring!
Doesn't look like a "frog" squating with all the weight, still looks/drives good down the road.
Luck and enjoy that runner.
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2001 Limited 4WD - 346+K - SunfireRed\Thunder Cloud; - 265/75/16 Michelin A/T2s - Fat Pat's 1.5" BL - StopTech ANGLED rotors - In series 699 trans cooler, New Yota1 transmission, All new OEM suspension front to rear.