Found a great way to add water to RV batteries
Maybe been mentioned before:
For those hard to reach area's of the battery compartments on any RV, to add distilled water get a cooks basting tool. Draw the water into the basting tool, remove the caps and you can reach the tops of the batteries with the tool and squirt the water into the batteries with out removing the batteries.
Took me 10 min. to service all four RV batteries, without have to move/remove any of them. Be sure you use distilled water.