I got this idea from a fellow camper while in Maggie Valley, NC back in October. I was having trouble with water puddling on top of my slide toppers and I think this will solve the problem!
I don't use these if I'm only staying for a day or so, only for extended stays.
This is the view disassembled. I used 3/4" PVC pipe and fittings from Lowes. They have two grades. I used the 480 PSI pipe so it would be stronger. I put 1/2" EMT electrical conduit inside the long pieces so they would not sag in the middle. You can see it sticking out the ends of the PVC.
This is a better view of the end assemblies. One of the legs is longer than the other to provide for the slope of the awning. This is the tricky part. The dimensions of the end supports will depend on your slide. You just have to get up there and take some measurements before starting. Turn the roller tube to tighten the awning to maximum, then measure the height from the top of the slide to the awning at the two points where you want the lateral support tubes to be. Then you will need to measure the width across the top of the slide to determine the finished length of the end supports. Then measure the length of the slide (not the awning) to determine the desired overall length of the support when it is assembled. This is where the fun begins. You just start cutting a fitting until you get it right! It's a little time consuming but well worth the trouble. DON'T GLUE ANYTHING until you get all the pieces cut so it's the way you want it! When you get it exactly like you want it, disassemble it one piece at a time and glue that joint before going to the next one. Obviously, you DO NOT GLUE the lateral supports into the end supports to make it easy to store!
This is the finished product after assembly and ready to slide under the slide topper awning!
This is the view in place and ready to do it's thing!
Good luck, happy trails, and God bless!