Just upgraded my system. We have a box built into the beach with a solar charger and the same winch you show.

I use the XT Series winch. I it is a little more but it pulls a little faster.

Also use a flexible solar panel. I have had two of the glass ones get broken over time. Below is an ebay link.
http://shop.ebay.com/items/_W0QQ_nkwZPowerfilmQ205WQ20RollableQ20SolarQ20Charger