I like a check/call here. If he has AK or AQ he isn't going to pay off our river bet anyways so the check behind doesn't cost us. It may induce him to bet a smaller pocket pair for value as our hand looks like an AK. If we fire again at the river he may fold that same smaller pocketpair. If were behind and he's waiting for the to bump his AA or set we don't have to pay off 2 bets.