Axis/Vegas is built on the E series stripped chassis. A new one would have Ford's new V8 (Godzilla), and most (all?) older ones would have the V10. Plenty of power and a good powertrain. The 24.1 is sometimes on the 350 chassis, and may have more limited GCWR, so you'd want to check that. Assuming it fits within the GCWR, they shouldn't have trouble pulling an Explorer.
On the Thor forums, most owners are pretty happy with their Axis/Vegas. For many markets, Thor is a low-cost producer (relative to the competition), and as such, one can be expected to fix a few, mostly minor, things with a new unit. If buying new, do a very thorough PDI. I expected to have to fix some things with mine, but ended up having almost no problems at all. I had the dealer fix a rattle from the furnace during PDI, and that's it. I'm very happy with it. (Mine is a Four Winds, not an Axis/Vegas.)
2021 Thor Four Winds 26B on Chevy 4500