How to Beef Up Rear Suspension on 2000 Avalon??

[2000XLS]

We love my wifes 2000 Avalon but when we have passengers in the rear seat and luggage in the trunk the rear end sags badly.

I don't see a way to add air shocks or air bags to this car, is the only way to change the rear springs? If thats the only way where should I get them? I don't want a rough ride but would like to add 400-500lbs of capacity.

Any advice is appreciated.

[toyomoho]

Might check the Camry forums as the two cars use the same suspension.

[avalonshoe]

which generation? im lookin for the same solution as well. this is one of the design flaws with avalons... theyre heavier than camrys as is.