I have an 05 Sequoia with ~63,000 miles. We tow a ~4,000 lb trailer a fair amount, and the vehicle is starting to hit the stops more now than it used to. We've got some unpleasant road "features" on I-405 here in SoCal, and when towing or with 4+ adults, I usually hit the stops when running through a dip or even a big bump going into a gas station or something. Parked and unloaded, the vehicle appears to be at normal height, and the springs are not visually defective, so I don't think they are to blame. I sense the shocks are simply allowing the rear end to compress too rapidly. Also, when looking at the shock, the space in between the shock cylinders is not uniform -- so they at least while the vehicle is at rest, the cynlinders are fitting together crooked. Maybe that's no big deal. There are no visual signs of leakage.
I don't want to lift the vehicle at all -- I want especially stock height and ride (although a little stiffer, i.e. more dampening) wouldn't be bad. I also want something that is going to last longer, as this has probably been going on for 10k miles. I searched the forums quite a bit, and have come up with these options as replacements:
OME 600002 - not officially supported for the Sequoia, but several folks have used them. It's not clear to me whether I would get any lift vs. OEM though. Is the ride comparable?
Bilstein 4600 or 5100 or HD - Is HD and one of these others the same thing?
Monroe SensaTrac - I've had these in the front of my Jeep Cherokee and have been pleased, but they don't do nearly the duty the ones on the Sequoia will be under. Certainly seems like the cheapest, although cost isn't a huge factor if the premium is worth it.
KYB K344406 - an OEM supplier, probably the closest thing to OEM, including build quality.