So I got the jocks yesterday, still waiting for my RM to ship, but I decided to try out the jocks with my old packers, and so far I am impressed. Keeps things much more secure and in place than just underwear. My willy is not trying to escape to my belly button like it sometimes does in trunks.
although I may have ordered a size too large so hopefully the RM isn't TOO heavy for this jock. Otherwise I'll need to order another, smaller pair.