Yes! The same solution I used for my waste pipes! I used to have an Apache Ramada hard sided pop up, I bought a 10' length of PVC plumbing pipe 2, 4 or 6 inch depending on needs. (HD or Lowes)
Then you get adapter fittings for a threaded cap on one side, and a solid cap on the other (cheaper, or do removeable both ends, to allow you to pull or push pipes or hoses out. Simple strap iron, or heavy plastic zip ties (that have a screw eyelet on the end) then allow you to attach the tube to a bumper, bed end, underneath r on the body!
A cheaper, easy fix is also a screw on set of clips (like tool or rod holders, that the bars can snap into, screwed onto the end of the bed.