Here's a simple comparison...

Rockcrawler, (on a rock). 44" tires, Dana 60's, locked, 200:1 crawl ratio 1000+ RTI at 30 degrees.



SUV, 32" tires, stock axles, 33:1 crawl ratio, 700 RTI at 20 degrees.



There is a huge difference, and yes, someday, maybe someone will take a SawZall and cut up a $25,000 Xterra, replace everything on it and make a rockcrawler.
A person with a clue however would buy a 1985 Toyota and start from there instead.