Hero (SB): $1,519.09 (253.2 bb)
BB: $1,106.36 (184.4 bb)
MP: $452 (75.3 bb)
CO: $600 (100 bb)
BTN: $606 (101 bb)

Preflop: Hero is SB with Ks Js
3 folds, Hero raises to $18, BB calls $12

BB is a newer winning reg who seemed to have just moved up from playing a bit lower. No significant reads at this time other than he's playing 26/20 with a fairly low 3bet over a 400 hand sample.

Flop: ($36) 5d 9s Jc (2 players)
Hero bets $24, BB raises to $72, Hero calls $48

Turn: ($180) 2c (2 players)
Hero checks, BB bets $135, Hero calls $135

River: ($450) Ac (2 players)
Hero checks, BB bets $337.50, Hero folds

Against fairly readless villains where I don't know their flop raise strategies (i.e. I don't know if he'll raise 2pair/sets on the flop) should I be just check/folding turns in this spot or should I be calling turns and calling most blank rivers with a hand as strong as this?