Better line here?

River 3-bet too aggressive? Ok to slowplay this flop, or is betting out best?

Party Poker 0.50/1 Hold'em (6 handed) FTR converter on zerodivide.cx

Preflop: thecamelot is BB with K:club:, Q:spade:.
1 fold, MP calls.

Flop: (6.50 SB) J:spade:, A:club:, T:diamond: (2 players)
thecamelot checks, MP bets, thecamelot calls.

Turn: (4.25 BB) 8:diamond: (2 players)
thecamelot bets, MP calls.

River: (6.25 BB) A:diamond: (2 players)
thecamelot bets, thecamelot calls.

Final Pot: 14.25 BB

First of all...

Why are you 3-betting a trap hand out of position preflop? It's probably not for value and you don't want to get capped with KQ out of position.

That changes things.

To me, it looks sketchy that the person who got the last bet in preflop didn't lead a board with 3 broadway cards.

HAD YOU JUST CALLED the raise preflop, I'd lead the flop, call a raise, and check/raise a safe turn.

I wouldn't cap the river when the board pairs.

You realize that a backdoor flush came out also, right? Can't cap river. Nuts too small by that point.

You had the lead going into the flop, so you should lead at this flop. This board likely hit your opponent hard too.

Don't 3-bet the river unless you can fold to a cap.

I dont like the 3 bet preflop, I really don't like checking the flop then leading the turn after just calling.