Unlike a vehicle, squealing politicians are usually trying to divert your attention from the real problem. Instead of having the listener focus on real issues to reveal how unseemly their behavior might be. Whereas, with a machine, an annoying squeak usually leads to a problem that can't be ignored.
I found the length of black iron pipe connecting the LP gas tank to the utility cabinet is essentially free floating. Suspended by the rubber hose exiting the tank and unfettered before entering the utility connection. Every bump in the road causes the weight of the unsupported pipe to bounce and "squeak".
Not particularly noticeable at highway speed, it is impossible to ignore at city speeds. Especially, at intersections or other grade variations.
Pinpointing the problem is easy. Just crawl under the rig and confirm it. Effortlessly moving the pipe up and down to replicate travel over a bump generates a squeak that is unmistakable. And, for me, ignoring it eventually becomes impossible.
I put a u-bolt over the black iron pipe and an eyebolt into an existing hole in the adjacent truck frame. I connected the two to form a pipe brace midway along the route. Effectively suspending the pipe with a sling and restricting movement.
I am currently on the road and made the repair in a hardware store parking lot. About four thousand miles from home, I am grateful to be rid of the annoyance. I am also curious why the restraint wasn't installed by the factory.