? - Is the ATF cooler being replaced? Do you have a way to monitor ATF temperature? If you haven't already figured it out, the tachometer and your ears will tell you when the torque converter is locked. I've found that a small drop in speed on the highway will usually allow it to lock back up, and that keeps the temperature down. I'd plan to replace the ATF every 50,000 miles, if not sooner.
Too bad about missing Big Bend; put it on the list for next time. Colorado is quite nice, but you'll find many trails blocked by snow this time of year. I'd pick a route through Arizona. Flagstaff is a nice town, you can stop at the ExPo office in Prescott, and Sedona is pretty, even if it is overrun with very special people. The Phoenix area is huge. I like the college town vibe of Tempe. Mass transit & Google Maps makes getting around cheap & easy, if you want a break from driving.
If you haven't been to Grand Canyon, that's an obvious stop. Lots of free dispersed camping in the area. Even if you don't go down far, I suggest a short dayhike down one of the corridor trails, if you're able. There's Hoover Dam nearby. You could also spoil yourselves a little with a night or two in Vegas, if interested in that kind of experience.
If you know the name of the manufacturer, that'd be good information to include in an ad. Are they bolted or welded on? If bolted, start soaking the fasteners down with a penetrating oil now to make removal easier. You may also want to see how difficult it is to reach the front-most nuts inside the boxed frame section; they can be a real pain to access. If welded, and you aren't in a position to remove them yourself, make sure to put that in your ad. As far as that goes, a cheapo Harbor Freight angle grinder, some cutoff wheels, and
PPE should be enough for removal. Post an ad in the For Sale section, and the regional section.