Has anyone every seen or used this Pro-Fill system for keeping your golf cart batteries properly topped up? http://www.campingworld.com/shopping/item/pro-fill-rv-edition-dual-6-volt-battery-watering-system/27035 I am going to be putting mine in shortly and will not have a sliding tray for a while. I'm going to use an end-to-end 6V battery box and it will be something of a bear to have to physically haul them completely in and out to check the water level in the cells. It looks very handy, but...

Anybody used one? Opinions? For 50 bucks may be worth a try anyway.

And Yes, I know there is a better way....& I plan to pick up a sliding tray at some time when I am in the U.S. Shipping on something that large will likley be a bit dear to Canada and I haven't found one up here yet..