OP here...
Lots of great posts, as many have said, there are pros and cons to each, just depends on how you are traveling and your own preferences. After reading this, I think what will happen is, I will buy a srw 350 to pull a moderate sized 5er and wet my appetite for a few years pre retirement. I drive a large suv but could equally use a f250-350 4wd as my daily driver and use for periodic 5er travel. This will be a relatively modest investment that will allow me to figure out what works for me. I suspect, after a few years of fooling w the 5er, I will be ready for something different and jump into a medium level DP.
By the way, speaking of MH, how many wives help drive. Seems 5ers are drivena little more by the spouse than mh