ACR ON APCH MUST TAKE EVASIVE ACTION TO AVOID SMT SEQUENCED AHEAD WITH NO ADVISORY.

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WE WERE CLRED FOR A VISUAL APCH BY APCH CTL TO RWY 19R. OUR TFC WAS AN SMA ON A 2 MI FINAL. WE PROCEEDED TO FLY A VISUAL PATTERN TO 19R; TURNING FINAL APPROX 4 MI FROM THE RWY. UNKNOWN TO US; THE TWR HAS CLRED THE SMA TO LAND ON 19L AND HAS SEQUENCED AN SMT TO LAND ON 19R AHEAD OF US. WE CONTACTED TWR AND THEY CLR US TO LAND ON 19R. TWR THEN INSTRUCTS THE SMT TO GAR AND MAKE R TFC. SHORTLY AFTER THIS WE SEE THE SMT IN A CLBING R HAND TURN; IN BTWN THE NOSE AND L WING OF OUR AIRPLANE. WE TAKE EVASIVE ACTION AND GAR. I BELIEVE THE TWR SATURATED WITH LIGHT AIRPLANE TFC AND TRIED TO RELIEVE THIS BY USING BOTH RWYS FOR GENERAL AVIATION. I DON'T BELIEVE THAT THIS IS SAFE IN AN AREA WITH THIS MUCH TFC. COMS WERE DIFFICULT TO MAKE AND HEAR WITH SO MANY ACFT ON THE FREQ. TWR HAD NO TIME TO ALERT US ABOUT SMT TFC; OR EVEN COORD OUR PROGRESS WITH THE SLOWER TFC. TCASII WAS NO HELP WITH THERE BEING AT LEAST 6 TARGETS; YOU HAVE TO BE OUTSIDE THE COCKPIT. THE WARNINGS ONLY ADD TO THE CONFUSION DURING THIS PHASE OF THE FLT.