Thanks to all for their pics and advice. I didn't pit any hinges on my door only a latch. I thought the screws heads/nuts could damage the hose when sliding in/out. I also added a second vinyl gutter under my sewer slide for use when laying out hose to drain at campground; it will keep my hose off of ground and protect it. Since it gets pretty hot out here in summer, I decided not to paint and just leave white.
I used stainless hose clamps (one 7" and one 2" connected together) to attach to bumper.
One mod I'm going to try tomorrow.....
I'm going to see if two vinyl gutter pieces will fit inside bumper as I would like to carry two. The one that my hose sits in has a stopper at both ends therefore can not be used to support hose when connected to drain at campground due to the stops. Also, it slides smoother when only one gutter is being used and gets a little tighter when I added the second piece of gutter.
Below are pics of my project. The other two I will install just behind landing gear and will open from door entry side (passenger side).
