My experience has been different. I found that if I ran the refrigerator on battery while towing, neither of my Explorers would keep the battery charged on either of my TMs. A little investigation showed that in each of the Explorers, the trailer battery charge line included several snap-together connectors, and some stretches of small-diameter wire between the battery and the Bargman connector. To solve the problem, I installed a parallel run of flexible #10 wire for both +12VDC and ground, directly from the alternator to the rear bumper. It was interrupted only by a circuit breaker and a relay (for isolation), both of which had bolted connectors. From then on, no problem.
Street rods typically have high-compression engines. In order to crank it over, the starter motor requires a very high current. If the battery is far away (in the trunk, for instance), then very large cables, such as #4, are needed. But there is no comparable demand in a TM.
Just my experience.
Bill
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