I do not have just one most worth it upgrade, but a series of upgrades from one place @X-Rack.us For me and my Bronco they are essential. My front receiver hitch, my trail sight rod holders, my rear cargo rack and my soft top side rail for my awning. For my beach trips they are things I can't do...
Oh yeah. it powers my fridge or my power station. They work in the 12 volt in the console still. I also tried other stuff in the rear outlet and it's out for sure.
I sell them for a living and kept telling myself I didn't need one all the while telling customers why they did and how great they were. Which they definitely are. I bought my 23 wildtrak for my 60th birthday present to myself. Best Birthday ever. I had it on the beach the next day. I also had a...
Actually probably carry way to much stuff in the back of my bronco And attached outside on front and rear receiver hitches. I run a morryde slide out kitchen with a blackstone griddle and a 12 volt fridge on a slide out. Both mounted on top of a ford/tuffy storage drawer. The struggle is real!
Been running mine now for 80k+ miles at hwy speeds and off road. No issues at all. Although I run Ironman quick release mounts I've never taken it off.