A simple RV hack recently touched off a surprisingly heated debate online. One RVer shared a homemade outdoor towel rack made from two Harbor Freight suction cups and a dollar-store broom handle. The setup sparked a debate about RV sidewall damage, with some owners praising the idea and others warning it could harm the coach.
Some RVers praised the rack as a clever way to dry towels outside the rig. Others warned it could damage decals, ruin the siding, or even contribute to delamination.
That raises an interesting question: Can a couple of suction cups really harm an RV sidewall?
The warnings came quickly
The original post attracted plenty of positive reactions, but the skeptics weren’t far behind.
One commenter warned, “You can damage your RV wall by doing this.”
Another called it a “great way to delaminate the siding.”
Others suggested attaching the rack to a window instead of the sidewall to avoid any chance of damage.
The concern is understandable. Most RV owners have heard horror stories about delamination, and nobody wants to create a costly repair bill just to dry a couple of bath towels.
Are RVers worrying about the wrong thing?
Delamination is one of the most dreaded problems in the RV world. It happens when the layers of a laminated wall begin separating from one another, creating bubbles, waves or soft spots in the exterior wall.
But here’s the important part: Delamination is usually associated with water intrusion, not with hanging lightweight items on the outside of the coach.
When water gets behind the exterior skin through a failed seal, cracked caulk, or another leak point, it can weaken the bond between the wall’s layers. Over time, the wall begins to separate.
That’s why RV technicians typically tell owners to watch for leaks, inspect sealants, and address water intrusion quickly.
A couple of wet bath towels hanging from two suction cups simply don’t create the same kind of stress.
“A couple of wet towels probably won’t hurt a healthy RV wall. A flagpole whipping in the wind is a different story.”
That’s where some of the online discussions may be missing an important distinction.
A lightweight towel rack hanging against the side of an RV is very different from a tall flagpole, Starlink mount, or cellular antenna mast. Those items can catch the wind and create leverage that places much greater force on the mounting point.
In other words, it’s not just weight that matters. Movement matters, too.
The bigger concern may be cosmetic
That doesn’t mean suction cups are completely risk-free.
Leave almost anything attached to the same spot on an RV for months at a time, and you may create other issues. Dirt can collect around the edges. Graphics may fade unevenly. Suction cups can leave visible rings or marks on some finishes.
Those cosmetic effects are probably a more realistic concern than a lightweight towel rack causing a healthy sidewall to delaminate.
That’s especially true for RVs that spend long periods exposed to sun, heat and weather.
A little common sense goes a long way
Most RV owners already know the basic rule: Just because you can stick something to the side of your RV doesn’t mean you should.
Lightweight items used temporarily are one thing. Heavy accessories, wind-catching poles, and permanent installations are another.
The homemade towel rack that sparked the debate appears to fall into the first category.
Will every RVer be convinced? Probably not.
But based on what we know about how RV walls are built and what typically causes delamination, the greater risk from a couple of suction cups is likely a dirty ring on the sidewall—not a wall coming apart.
And if the debate online is any indication, that may be enough to keep RVers arguing about it for quite a while.
The two key words are temporary and light-weight. I’ve used suction mounted hooks for several years, mostly for two things, to keep one end of a dog tie-out line outside next to the entry door, and to hang a Christmas swag. Neither hook stays in the same place for more than a few weeks tops.
Related, but not the same topic, cheap suction cups won’t hold long in place anyhow. If the suction cup becomes even slightly less flexible due to sun exposure they will hold significantly less weight for less time. If you are going to do this, buy higher quality suction hooks.
I was really interested in the subject of this article but it didn’t really give any information just that people have different opinions ( no ****) would have really appreciated an opinion from actual industry not just fluff
I’m at a Newmar rally, where MagneShade is doing installations. They use small suction cups to help hold the sticky side of the magnet in place on the windows. They said never use these same small suction cups on the paint, as it will leave a ring.