Bluff Turn and/or River?

Full Tilt No-Limit Hold’em, $20.00 BB (6 handed) – Full-Tilt Converter Tool from FlopTurnRiver.com

CO ($2441)
Button ($2814)
SB ($4000)
Hero (BB) ($6186)
UTG ($2278.70)
MP ($630)

Preflop: Hero is BB with 3, K
4 folds, SB bets $40, Hero calls $20

Flop: ($80) 5, 4, 6 (2 players)
SB checks, Hero bets $33, SB calls $33

Turn: ($146) Q (2 players)
SB checks, Hero checks

River: ($146) 10 (2 players)
SB checks, Hero bets $88, 1 fold

Total pot: $146 | Rake: $3

Results:
Hero didn’t show 3, K (nothing).
Outcome: Hero won $143

This is a spot where I think checking turn will yield almost as much fold equity as betting, and for a far cheaper price. Villain rarely has the As, unless he has a pair to go with it. If we bet turn, we’re repping almost exactly As, a straight flush, or a bluff. Maybe Villain will give us credit for value betting Ks on two streets, but that’s about it. By checking turn, we can bet river and rep a far wider range. Also, the turn check makes it look like we have some showdown value and thus don’t need to bluff river. I’m even thinking that if Villain bets river, I can put in a big raise, again recognizing that he doesn’t have the As and probably not even a good spade for the same reason.