Recommend getting a 4Runner with KDSS, it will make a noticeable difference in Body roll in turns and emergency maneuvers (changing lanes quickly). Sold my last 4runner because of the color and made sure to get KDSS this time. Its great. If KDSS is only available on the Off-Road, then get the Off-Road.
Others have suggested a Sienna or Highlander, don't do it. The 4Runner and Lexus are totally made in Japan and come with the dependable reliability you are talking about. If you keep the tires stock size and are a conservative driver you will get the gas milage advertised by Toyota on those trips from Texas to Florida.
Would also suggest you get the rear sliding cargo tray if you can, keeps from scratching up the rear bumper when loading heavy items. Also keeps the rear floor flat, level with the second-row seats folded down.
There is a great forum here also for support. Quite of few good peeps on here that quickly respond and can help point you in the right direction for help.
Your right, the nav is pretty much useless and always use my phone anyways, google is much better.
Good luck with your purchase, just retired myself and am hoping this will be my final vehicle. Not putting as much miles as you will be though, many peeps have posted their 4Runners getting 300,000 miles and more. Hope you can find what you like. You never know, the stripes might grow on you. Don't like pinstriping myself, makes waxing more difficult.