What is the value of a 200K vehicle?
Could be anywhere from nothing to 5K+. Depends if it is running or not :) Often at this age/mileage, people drive them until there is a problem worth more than the vehicle, then scrap them. But if you are talking a nice bigger truck that is still running, then it may be worth 5K+. Our ~200K minivan is worth about 5K in good running condition. The huge savings comes in because a car does most of its depreciation in the first 100K miles.
Looking at our Civic, its been worth ~4-5K since about 120K miles. It will continue to be worth about that as long as it is running. It depreciated 10K in the first 100K miles, and now it is rpetty much flat from here on out.
The old message to sell at 100K was because most cars catastrophically died around 100K. That is no longer nearly as true (although of course there are always lemons).
In terms of what to buy: I will say we love hauling crap in our old minivan, and we can easily put a trailer on it if needed (we rented one for 20$ from Uhaul when we needed to move a playset). I can fit sheets of plywood AND 2 children in it! Win win, lol!
On a more serious note, a friend recently bought a small truck (she is a farmer) and landed on the Toyota Tacoma. Hers is a early to mid 2000's and has around 100K miles, I believe. She has been very happy with it. I have a few relatives with CRV's and RAV4's, and I would say they are kind of a joke to haul stuff (about the size of our Civic, they just sit up higher). But again, you can easily put a hitch on and tow a small trailer. I am not too familiar with mid size SUV's, all I know is they get pricier than a minivan, fast, and I'd rather have a minivan with twice the interior space, same fuel economy, and lwoer price tag, than a medium sized SUV. YMMV.