It totally depends on the board and the person you are against. I make alot from people calling down with KT on a K62J5 board, but if It was like..KQJ98 suited then id probably have to give it up to a bet.

I dont think this is a problem you can reduce to just a couple of lines. Some players will make huge bets with any 2 with a busted draw on the river if you check, Some will make bluffs that look like value bets when the miss a draw on the river, some will only ever make a bet with 2 pair or better. You gotta know your players.