I will fit rollers to my next van. Not for the security really, although that’s an added bonus. I think they give a wider range of angles the hose can be reeled off the van, they keep the hose nice and low when it’s being pulled off reducing tripping hazards, and keep it from rubbing anywhere on the body work.
I don’t think they’d make much difference on resale value, there will be holes from the tank being bolted down any way, another one at the back won’t matter. Sikaflex a patch over the top then fit a plyfloor and no one would notice.