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I don't think anything but maybe wires to rear. heavy susp. brks cooling sys ???
Back then all we had to choose from was a hyd / elec brake controller.had to tap into brake line. Now it's hard to find one!
I like the "prodigy" brake control. simple 4 wire hook up, good for 2-4-6- or 8 trailer brakes. very adjustable for level / loads. Just don't use a fuse for this OR battery charge wires, use a auto re-set breaker 20 amp for brks 12 ga wire, 30 amp for charge 10 ga.
how big is your tlr? using a frame mount hitch / weight distributing hitch ??
wayne