One thing that has been mentioned briefly a couple times is -- how are you planning to "fulltime"?
If you are looking at becoming a "seasonal" and stay long term at only one campground, the limited towing you will be doing is fine at maximum rating.
If you are thinking about traveling all over the USA, I think you would be happier in a tow vehicle that is much more capable, most likely giving you a more comfortable towing experience.
Have you "RV'd" before? You might want to think about "part timing" at first, basically taking months long "camping" trips to see if long term living in a camper will work.
Whatever you decide, have fun and see you on the road! Congratulations on your retirement!