I agree with this!!
I've owned many built off road/expedition type rigs. My last rig was a 2016 Tundra + FWC. The biggest issue is bigness and weight! I wanted more luxury and absolutely love the Sprinter Chassis. So bought a Winnebago View (one that can run any diesel) with the intention of doing a 4WD conversion. Trouble is, I've driven it nearly 10k miles and the last trip was well over 200 miles off road and haven't needed 4WD. It's been in the snow, sand, dirt, gravel...
Realistically, you get something big and heavy 4WD is less needed. Mine is lifted (clearance), 31" Duratrac Tires (traction), On Board Air -- Good tires and deflating them works magic. Although, I'm looking into a divorced tcase for low range when crawling up hills. I've put the front tire a couple feet in the air... several times. Incredible how ridged the chassis is. I have no doubt I've ventured further off road than most Tiger and Earthroamer Rigs. Plus getting 16-18mpg fully loaded.
Traditional RVs are an excellent option if built with a welded (not wood) framing and fiberglass sections (especially roof). And they are a heck of a value when 5+ years old. There are a good number of quality manufactured rigs. Then add the 4WD or whatever you desire.