downsizing rental rigs - reserve size choices

[pchapman 279]

Question:
I'm curious what the philosophy is at DZ's for the reserve sizes in rental rigs that are used for downsizing. E.g., 150 to 210 sq ft mains.

For advanced students, do DZ's insist on a good sized reserve (such as the same size as the main) or are they OK with "one size smaller" because after all, a reserve isn't jumped every day?

Sure I read manufacturer's wing loading charts what's common in practice? Plenty of people jump rigs where the reserve is "a bit small", but they survive, maybe with a little dirt and scuff marks.

I'm asking because sometimes a smaller DZ won't have custom-built rigs, but might instead just throw together older gear to make a handy downsize rig. (E.g., "Hey, here's an old Vector II, we can throw that Sabre 170 in it. It'll be OK with its Tempo 150?")