I almost bought a 4runner before I picked up my Ram. Love those things.
Anyway, one item to note. Toyota isn't the only manufacture with a shortage right now, and 4runners seem to hold their value better than a lot of vehicles from what I've seen on the used market previously. If I were you, I'd go to test drive and sit down to do numbers (but don't sign), then take those numbers and compare them to what sorts of discounts were being posted for the specific truck you're looking at back in 2019 and early/mid 2020 before the chip shortage. There is a good chance that the additional discounts you're missing out on from Ford/Ram outweigh the increased value of your 4runner. Last I heard guys were still getting offers at or above what they paid, often times at MSRP, for their Cummins trade that are 2-3 years old at this point, and considering they probably received 10k+ discount, it's a huge increase. Where as your 4runner may have maintained it's 4k value or something, Ram has taken away much of the discount and the market has taken the rest.
I don't know any of this for sure, but it's important to not just look at what they are giving you in trade (or what you can make selling yourself) but also what discounts you aren't getting. If you have the time do a little digging and see what you can dig up, you may have more time than you thought.