I can't see my tanks due to an enclosed underbelly. I only hope it's secured well.
After 2 years of ownership though and carrying a full fresh water (and full grey/black at times), nothing has fallen off yet (knock on wood). I have had some bumpy roads while traveling too!
I also made a post before about better handling with fresh water full. The trailer pulls much better with a full fresh water tank due to the fact that it must be located in front of the axles increasing tongue weight. I notice a big difference when it is empty and even worse when it's all moved the grey tank.
I have city water so I prefer that over the sites well water as well. Well water gets stagnant in the lines if not flushed out. My city water can sit in there all year and be fine from the chlorine they add in.
