Hello and welcome, I'm in the process of conversion, rear engine as well. I'm going off grid too and came across a great deal Thursday on ebay for 150w solar panels, I don't know the seller and have no relationship with them but this is the info if you want to have a look:
The seller is taking offers, I got 4 150w 12v panels new $132 each. Here is the auction, if you are interested, less than $1.00 a watt is great, .88 per watt is amazing:
http://www.ebay.com/itm/N-POWER-CRYS...item19f39d9948
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