multiple problems with new Forest River

I didn't loose a lot of water through the tank fill opening or vent tube but I did find that I was loosing some. I bought some small corks and a rubber stopper from the assorted specialty hardware drawers at Lowe's or Home Depot. I use one of the small corks to plug the vent tube opening. I added a small picture hanging D-ring that only uses one screw to the large end of the rubber stopper and use it to plug the water fill opening. The rubber plug is large enough to fit smug so it won't slide down the fill tube and the D-ring gives me something to grab to pull it out. I haven't lost any more water while bouncing along down the road or while making right turns.