There are a lot of toy haulers this size for sale in the Phoenix/Tucson area. If you're willing to travel into S. CA, this opens up a lot of opportunities as well. Craigslist, rvtrader.com, rv.net, etc. are good places to search. In AZ, there's the added incentive to purchase from a private party--AZ does not collect sales tax on private party transactions.
21-24 foot toy haulers are typically going to weigh 6,000 lbs. plus, empty. Add in real world gear, water, and toys, and you're talking about an additional 1500-2000 lbs! Near the max tow weight for your Toyota. Do NOT believe (or trust) the empty and tongue weight advertised in manufacturers sticker/brochures. They're rarely, if ever, accurate. From my experience, toy haulers of this length that weigh less, have usually cut a few corners to get the weight down--specifically the frame and surrounding ramp area structure. Tongue weight, even with 21-24 footers, can exceed the maximum payload for the Sequoia. Highly suggest verifying the tongue and empty weight with a scale before purchase.
Make sure you have a good, thorough PDI accomplished by someone you trust. Although most ignore it--it's important to also crawl underneath and check the the frame/chassis closely on any toy hauler--especially important to do on the Weekend Warriors. Any "seperating" seams underneath, inside walls, wheel wells (inside/outside), etc. are of concern! Any recent "repairs" (on any toy hauler) to the roof, walls, flooring, or frame, should be looked at closely with some suspicion. FWIW, it's easy to overlook (or cover-up) water damage--this kind of damage can be very expensive to repair.
There are lot of opinions about what consitutes a "good" toy hauler (or TT). IMO every toy hauler/TT, regardless of manufacturer or model, has the potential to be substandard. It could have been substandard the day it rolled off the assembly line--it could be substandard because the previous owner didn't do any preventative maintenance---there are no real guarantees--it's buyer beware. The RV industry is not like the automotive industry where quality has been refined with realworld results.
Good luck!