Can i increase my carrying capacity if i install heavy duty coils?

I have a 2002 Toyota Sequoia and it has coil springs all the way around. I was wondering if i merely installed some variable rate coil springs (so it still isn't like driving a rock) that have a heavier weight rating if i could load my SUV heavier. On vacation I carry 4 people, their luggage, and a small 14 foot pop-up camper. I'm using a weight equalizer hitch, and as it stands, i am maxed on the back axle and could carry 200 lbs more on the front. If i installed heavier suspension, can i expect my axle and chassis to be able to handle the extra weight? and how much more?

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Re-design5 years ago
The main limiting factors on load ratings are the springs and BRAKES. If you get the upgrades offered on new p/is and van the only things changed are the springs and bigger brakes in almost all instances.
As far as I know, the axle limits on the vehicle's plates, set the legal maximum for that vehicle - whatever you do to increase the load makes it illegal to drive, if the weight is over the plated weight.

It MAY be different where you live, and it MAY be possible to get the vehicle testing authorities to uprate you, but I wouldn't hold my breath.
Vyger5 years ago
I think changing the shocks to adjustable air shocks would be one way to go. However, everything becomes a factor if the weight becomes to great. Tires would be a another concern. Plus the transmission being able to handle the extra strain.
The max ratings are not the breaking point, just what is suggested as to what you should limit things to. Engine performance will be impacted also. overheating and excessive fuel consumption can occur.
I have a 3/4 ton pickup that I have loaded down with 5.000 lbs of coal. It did ok with that load but I would not want to do it on a regular basis.