i always tip for all of them if the job is well done, when i am pulling up and there is a certain amount of effort by the staff. Tip accordingly and I think it is important to do so. If i pull in and have to do everything myself or there is zero effort then notta. Gas dock usually a five or so, if i get a hand or two pulling up to a city dock and they help tie off then a couple bucks apiece and i do think it is appreciated (generally is around here anyway). Out at the Bay i usually throw Jon a twenty a day for how ever long i am there, he does a great job running the dock.