SumoSprings is a high quality well-known manufacturer for 'cushioning' the ride on TV's that have additional loads.
I didn't know the Highlander has the McPherson struts on the rear, so no airbags, but SumoSprings makes a 'helper' for them, seems to have good reviews. https://www.etrailer.com/Vehicle-Sus...cc-onlyreviews
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2008 2619, 85W factory solar, 150W Samlex inverter, 40 gallon fresh water tank, dual NAPA 8144 225Ah 6v batteries, WFCO WF8955A 3-stage charger/converter
2007 4Runner 4WD V8 tow vehicle, Firestone airbags, 600W Samlex PSW inverter, Toytec Boss suspension
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