Heck I do that a few times a year,
but my YJ weighs less than a Cherokee.
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Did you have any idea "offroadohio" what your total trailer weighed? My trailer/Jeep combination weighs in at about the limit for a gas powered automatic transmission Libby at five thousand pounds. I use a load leveling hitch to minimize fishtailing and only one of my trailer axles has electric brakes. Since I'm at the limit of my Libby I drive about 55 MPH with the O/D off. Boy does my gas milage suck.
I'm interested in learning more about your ****** temp gauge. Does your Libby have a Mpoar trailer package? (i.e.: ****** cooler)
There are a few articles on how to wire up a brake controller in a Libby. Just search the KJ or LOST forums.