kicker

with prices of gas going through the roof - I'm thinking about adding a kicker to my V-21.

a couple of things I would like to get feedback on :

how many horses to push this puppy for trawling ?
2- or 4-cycle ? - (I'm leaning towards 4-cycle - no hassle hooking up oil line, but just the gas line -since my 2-cycle 150 HP Johnson has oil tank/injection ).

what brand ?
who's got the good prices ?
reliability ?
mounting bracket ?

thanks,
chipde