You guys must have gotten more detail from another thread or more information. How'd you know he has a StarCarft and he's going south of the border? Anyway, unless you had a lot more time for research and/or looking for other campers.....I'd probably follow the other advice and look into cheap temporary fixes to the TC and just roll with it. The people down there are wizards at making what we would consider junk and making it last decades.
Otherwise, Hallmark and Outfitter pop-ups are pricey, very nice, and very well built. Other options Phoenix, 4Wheel, lite-craft.....what's that other no-nonsense one....."living Lite" or "real lite"?
Here's what Don and Janet's Outfitter/Dodge Ram combo looked like and last summer could have been bought as a combo for $50K.

Good luck! What, you got back from Texas to Alaska and back and decided to go the other direction? Very cool!
For what it is worth, People have made it down and back with rigs that aren't all that off-road capable. You wouldn't be exploring off on 4x4 roads in a rig like mine, but the people that took it down there mostly stuck to major roads and did other exploring by other means.