Not so heavy once they are upright. Much heavier once one is mounted, & climbing. It's a bit like making love to a beautiful woman.First check your goal - make sure it's within your reach.
Make sure your extension is well waxed, and can extend to it's full extent.
Ensure once it gets there, that it can do the job, it may have to go up or down for a bit until satisfactorily situated.This may have to be repeated many times. There could be failed attempts too, which a cup of tea might remedy. Try again.
Once there, it may have to be there for a while.Particularly afterwards.
After it's done with, it may be erect for weeks after, yet redundant.
Once it's retracted, it might need cleaning again. Depends what mush it has had to go through, & how long it was left there.
Once it's removed & taken away, usually it's ready for operating purposes again pretty quickly. but not in she same place. Unless there's a complaint (?) & you have to go back & put it up again.
So long as you can fit them on the top of your van, you should be Ok.
