If villain was 3betting a ton I don't mind 4betting this, but my default play is to call.  Also, JT96ds can actually be dominated by lots of hands that they 3bet/call 4bet, like better rundowns.

Flop I'd play the same, his small bet is really weird and we might be drawing slim, but can't really fold to this small bet.  But I think he will bet bigger with total air like AJT5$ds, and most of rundowns either hit a pair (Qx) or trips on this board, so who knows, he might be betting small with those hands plus some weird AA/KK combos.  Against that range, raising seems okayish but a bit dicey.

I thought about leading on the turn too, but the problem with it is that flop was rainbow and T improves a big chunk of our flatting range, so we can't really rep air when leading the turn.  Still, I guess we can get called by suspicious AA/KK that will check back turn a decent amount of time (if we bet small), and it's very unlikely that we will get bluff raised by bare trips.  That makes me like bet/folding, but it gets trickier again if he just flats on the turn and we get to the river - against this guy who has low AF I think we are probably behind if another bet goes in on the river.  Because of that, I don't know, I'd x/c turn and x/decide on the river, or bet river if he checks back turn (and fold if he jams).  

As played river looks like a fold.  First off, you have lots of trips and straights in your range, yet he doesn't care and triple barrels.  Secondly, he bet very small on flop and followed up with larger bets (but not terribly large) on turn/river - if he were on a bluff, I think he would have started with a bigger flop bet.  Thirdly, we don't block any boats except for TT, which is unlikely.