Dc to Dc charger for trailer batteries?

[Firefly0556]

Has anyone wired in a dc to dc charger? I am assuming that the power coming thru the 7 pin wont be enough to charge my 200amp lithium battery bank. I read on this forum or another one that its hard to get a dc/dc charger to work on the ranger. But for the life of me I cant find that post now.

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[Frenchy]

For the most part it should be strait forward as long as the manufacturer of the charger has good instructions. Redarc has a good set of instructions and nice quality as well so that might be a place to get one from.