I had a look, but I'm not putting the thing in storage, so I would not see any value in putting them in the M/H, as I am in and out of it, a couple of times a week, you would relay need to have the thing sealed. I don't think they would work with the skylight vents, I wouldn't have any criticism with using them, in a sealed van in storage.
I have been using similar product in electronics control box's for years, sealed in and replacing them at every service, ( they can be refreshed, on low heat in an oven, ( after the roast is cooked
at the moment, one of my headlamp's, has condensation on the inside of the lens, I have put a couple in the the back of the unit, behind the sealing cover, appears to work works great, so far. The whole front of the van, bumper assembly and wraparound to the sides, has to be removed in order to replace the headlamp unit.
but a new product to absorb damp in caravans and Motorhomes.
