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The Montauk 150 has a reputation of being underpowered compared to other models of similar weight and size.

With a full load, you will need a prop that allows the engine to accelerate as well as help lift the stern. Tubing requires the same type of prop.

The Montauk 150's Mercury 60 hp motor is equipped with a Vengeance 13 3/8x14 stainless steel prop from the factory. With just the operator, no gear, low fuel, it will get to 35mph at 6,000 rpm's at WOT. Not a speed demon.

If you drop down 2" in pitch, you will gain rpms but loose a bit of speed. Given the load, I think you are close to ideal with a 12".

Remember, prop size is NOT universal. There is diameter and pitch of the blades. Changing one of the elements changes alot.

To keep a connection to the current performance benchmark, you want to stay wih the same make and model of prop and just change the pitch , not the diameter. If you do change, you will be taking a bit of a guess.

There is a rev limiter but if you hit it the prop is definitely inappropriate.

Pulling a tube with 4 people in a Montauk 150 will challenge the motor. You may want to have 2 props. The factory supplied prop for cruising and a second one for tubing.

If the dealer recommends a prop, will he take it back for exchange if its the wrong one (usually not)?