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These bet sizes often mean that, on the flop you didn't raise so you must have high cards that haven't paired yet peeling one off. On the low turn, he bets bigger to make you fold said big cards but you don't do it. On the river, he wants to showdown cheapish because he has no freaking idea what you have but has something with showdown value himself. You are rarely ahead on the end but every once in a while they'll show you a small pocket pair.

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I feel like this sittuation is either a mild hand looking for a showdown, like you describe, or something like 89s or 88's that put out a feeler on the flop and is then looking for value on turn and river.