My rear end on my 2012 Sequoia Platinum is sagging. I'm sure it's related that there is a light on the dash that now flashes all the time and the switch that adjusts the load doesn't work. I didn't buy the Sequoia to pull anything with or haul any heavy loads. I checked with my local mechanic and he says it will cost about $3,000 to replace the shocks because of the air bags. What are my options? I thought about just replacing the back shocks with coil springs. I see that some folks jack their Sequoias up and use an aftermarket air bag, so that may be an option too. Since the Sequoia is basically built on a Tundra frame can I use Tundra parts? Also, since the whole back end of the car is sagging, could it be a leak in the line or a problem with the switch?