I used to have a PLASTIC sewer hose support. Silly thing kept cracking at the plastic hinges. Stole an idea to use a plastic rain gutter supported by those crappy Linx Levelers. They don't work too well for my RV (I broke a couple) but they work great for other things. The plastic rain gutter I bought was 10 ft long so I had a friend cut it in half for me (cost me a pan of brownies) and I stacked one half in side the other. The inner/outer sections slide apart and I put a little screw (total of 4) in a pre-drilled hole and just lay the hose in the gutter at a pretty good angle. I have noticed they make a plastic screen that just pops into the gutter to keep leaves and debris out of the gutter. I'm thinking of getting that as the gutter collects fallen leaves, etc in the spring and fall. (note: I also spray my sewer hose and gutter to keep bugs from using it as a major highway into my RV). I strap the gutter to the back of a hitchhaul along with a few other things when I travel. More than once, I have left the sewer hose in the gutter, capped up the ends and just wrapped a couple lightweight ball bungies around it to hold it all together, then strapped it to the hitchhaul. Sometimes I get a tad lazy. At my age, I feel I have earned the luxury of being lazy once in a while.
I have been in many parks where it was against the rules to have a hose laying on the ground. I have also been in many that do not allow you to hard pipe to the sewer inlet.