I will recommend that if you don't have the load leveling suspension, with 425 Lbs. on the hitch you will definitely want to install airbags. I tow my pop-up (~150 Lb tongue wt) behind my receiver hitch-mounted 4 bicycle carrier (carrying 4 mountain bikes at ~100 Lbs. including the carrier) and the rear bumper of the sequoia would sag about 3-4" before I added the firestone airbags.
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2009 Camry Hybrid (wife's car)
2001 Sequoia Limited (family SUV)
1999 Solara SLE (kid's car)
1995 T100 4x4 (my toy)
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