I own a dock business and sometimes the easiest thing to do is tow the dock in place. This year ive built a motor mount so I can drive the dock into place rather than tow. Ive looked around and it seems like a 6HP with a self contained gas tank is what I need. Who knows who the best manufacturer is? I know Mercury Tohatsu and maybe one more are one in the same, so why the price difference between them? I need something that I can hook up and go without problems. Any insight is appreciated