RV Tip #1... If your rv's toilet has a slide valve between the bowl & the waste tank, make sure -absolutely sure- that the valve is closed before you tow the trailer! My bride made the mistake of leaving the valve open. Before leaving the campground I did a check of the tires, signal lights, hitch etc. but I didn't check the toilet. I will never ever make that mistake again! The toilet had only been used two or three times so we didn't dump the tank before making our return trip home. I figured a little sloshing around wouldn't hurt anything. Ya right! Now if you dare, use your imagination. Think sewage. Think open valve. Think sloshing. Accelerate = backwards slosh. Braking = forward slosh. Oh the inhumanity of it!