I did consider both replacing the wood with an aluminum stud (somehow) and replacing with pressure treated wood, but since we are planning on taking the TM on a trip this coming Thursday, I figure next time I'll do a little more research (and have some additional time to do it) to devise a more long term solution. I was just worried I wouldn't be able to devise a fix at all, let alone get it done in time to be able to take the camper out
Those replacement lag bolts (2 1/2") seem to have much meatier threads and certainly gripped the new wood tightly, so I think I bought myself some time in that area at least