Well, I am currently returning to Colonia to get rid of my HRP. I mistakenly believed that it would protect my hull against damage. This transpires not to be the case. It only applies to combat damage. How it knows what type of damage is being received is what I want to know!
Yes, this an explorer gripe but consider the chase through an asteroid belt where the environment becomes part of your strategy and may hit an asteroid or debris. Or when you collide with your enemy. You'd expect that HRP to be earning its outlay then wouldn't you?
HRPs do help against collisions. Collision damage is untyped (used to be kinetic a long time ago, but they changed that), so resistances won't help, but the greater hull integrity most certainly will.
I pull all the HRPs off my Corvette then drop it on a high-G world with my shields disable and the thing will explode. I use my combat HRP loadout and she'll bounce four or five times before I get worried.