Did you put any oil on the aluminum foil to keep the oysters from sticking?
No, I never had a problem with them sticking to the foil.
I think I know what kind of rig you got at Cabela's. I used to fry turkeys for Thanksgiving and Christmas when we lived down in the country, but my outdoor cooking equipment was among the things I sold in a garage sale when we moved back to town about 6 years ago.
So, a couple of weeks ago, I did some shopping lots of places and eventually bought a 35 gallon turkey frying rig from Cabela's. Now it also has the basket for being a fish fryer, but then I saw a really nice stainless steel fish frying pot, basket, and lid at Academy Sports, so I bought that, only to find out it won't fit onto the burner of the turkey fryer, so I bought a separate burner for it.

I've got two 20# propane bottles, and 4 outdoor propane burners now.
Incidentally, peanut oil is cheaper at Academy Sport than Walmart or Sam's Club. And the injectible marinades are cheaper at Academy Sports than at any of the grocery stores (Walmart, Brookshire's, Kroger's, and Albertson's).
And just as an experiment that may or may not turn out well, I injected the
Creole Garlic marinade in about a 3# pork sirloin roast, and about a 3# beef eye of round roast today and put them back in the refrigerator. They'll go in the smoker in the morning with hickory chips for smoke and we'll see what happens.