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Scenario is very unclear. Not an RV. The car hauler trailer does need a battery for its emergency breakaway brake system (by Law) so "the battery" might be just for that.
No idea what the rest of the scenario is, and so no idea what equipment is needed. Eg, is the tow vehicle with a slide- in camper as the RV part, so you use the camper at events the car is for? Whatever, you get better answers to your questions if we know the scenario.
Back to the original OP question, that PowerMax converter is the nifty LK model, so it has adjustable voltage. So you can get any old solar controller with no adjustable voltage, measure what voltage it does, and match that with the LK. If you actually need to or want to.
No idea what the rest of the scenario is, and so no idea what equipment is needed. Eg, is the tow vehicle with a slide- in camper as the RV part, so you use the camper at events the car is for? Whatever, you get better answers to your questions if we know the scenario.
Back to the original OP question, that PowerMax converter is the nifty LK model, so it has adjustable voltage. So you can get any old solar controller with no adjustable voltage, measure what voltage it does, and match that with the LK. If you actually need to or want to.
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