I own my lifted 4X4 that can crawl up just about anything. I work out of the bed of my truck and a drop of 4" would make work much easier. Try lifting an anvil at the end of the day after shoeing 8-10 horses. That 4" would mean just barely lifting the anvil at hip height and sliding the anvil in the bed vs. straining already strained back muscles. I need 4X4 because I live in CO and I need a truck to carry my supplies.
All of you that are sticking to the "4X4's should sit high like a 4X4" statements are thinking from aesthetics not functionality--unless, of course, you wheel your $32,000+ vehicles( I could go on aobut why I think that is ridiculous. )
More than likely not going to do this due to the cost but it would be entirely functional and make sense.