Anybody see anything wrong here for my water hookups?

I would never connect to the black tank rinser save when rinsing. and then make sure there is a vacuum breaker and possible other back flow rpeventers in line.

So, how to modify to make it good........

Put a QUICK DISCONNECT on the Rinse line.. Hook up to rinse, then flip the lever When done flip the lever and unhook, let the vacuum breaker drain back and put an AIR GAP between the two lines. This is, in fact, part of how I do it.. The other part of how I do it is not needed.