Renogy has a few MPPT controllers as reasonable cost, though I did not find the $120 panels you mentioned. The Grape Solar panels sold by Home depot are a little more at $135 but I can get a replacement shipped to any store in the country if I have a problem on the road.
To help offset the system cost I was thinking of installing a preheat tank for DHW in my house and powering it with the solar array when the trailer isn't in use. DHW is a big expense for us, even in summer.
The trailer (2002) has a built-in charger though I have no idea how good it is. RV charge units seem to have a bad reputation among RV'ers for cooking batteries.
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