It is nice and essential on a long trail. I have not used the Ready Welder, but I do have a MobiArc Welder. I have used it since 2005 and it has saved my Buddies, fortunately I have not broke my Rubicon. My buddies did have a Rear Diff Tube break on the Rubicon and also, one spun the tubes, had several Steering Boxes break off, and etc.
http://www.perfectswitch.com/mobiarc200x.htmThe company has been really good to work with and I do recommend them.
Have a great Wheeling weekend!