[djr]

4th, unlikely you're against trip jacks unless this guy is the ultimate slowplayer. T8 may have trips, but more likely two pair or a 89TJ straight draw and is trying to buy a free card on fifth. The only reason I don't raise 4th is because you're not knocking anyone out and although I'm betting you're ahead now, three people drawing against you isn't good. See fifth and decide then what to do.

5th, you need to bet, give them a chance to fold now that they didn't hit anything good. But if it's raised I'd call it down. I'm sure others will say fold to a raise. But I've been in this situation before at these limits where they'll raise with a weak two pair (that you easily beat with aces up) just as likely as the straight/trips/flush they're fronting. The pot odds are good enough to see the showdown if it can be done cheap.