What's there to pinch apart from your poles, which are easily removable at the end of the day and kept somewhere securely indoors. I park on a secure drive, with padlocked gates, but I still take my two SLXs out of the van and lock 'em up.
I would be surprised if they wanted to nick my hose reels, pumps or flow controllers; which are fitted to the van anyway (not the reels).
So if it's only poles, lock 'em up when you finish work.
(I'm also getting some security cameras fitted to cover my drive!)
When I was in a previous life as a sales geezer I always had "hot hatches" Cavalier Sri sort of thing which the local toerags took great joy in "lifting" from time to time.
So I padlocked the gates.
So "they" used bolt croppers on the padlock.
So I used a much tougher padlock.
So "they" sawed through the metal of the gates
So I put a bar thingy lock on my steering wheel
So "they" sawed through the steering wheel rim!
It wasn't until I got solid gates with an integral lock that it stopped.
Then about ten years ago the main toerag got banged up and I went window cleaning and strangely no one was interested in nicking my Volvo 240 Estate!