Personally, I have never tied up at the B&B Seafood dock overnight, but I certainly have purchased some EXCELLENT seafood there, and then anchored farther upstream on Mosquito Creek for the night.
There is a sunken shrimp trawler in Mosquito Creek between B&B, and the upstream anchorage, but I have always been able to carry at least 5 feet over the derelict.  Once, one of the locals told me not to worry about the sunken trawler, as it was marked by a float. When I checked out the creek's waters for myself, there were at least a hundred floats marking crab pots and fish traps. There was NO way to tell which marked the sunken vessel.

B & B Seafood House MM 513.5 ($1.25 a foot)
I stayed here a couple years ago and I talked to the Owner last week in case I had to stop there.  Some people, like me, tend to stay in a marina or at a dock in SC due to the tidal differences and the fact that single handing makes anchoring a little more  difficult if the weather is bad or the tides are running strong.  B&B is handy for those like me because it is halfway between Charleston and Beaufort.  Unfortunately they don't always answer their phone so many people pass this spot by.  This is a small floating dock, made up of several different size dock sections.  B&B has their own shrimp boat up forward on a fixed dock and they have a boat ramp forward of their shrimp boat.  At most they have room for 2 30 footers, if they share nicely.  If you are on your own in a 40 or so you will fit fine if no one else is there.  They have a little general store for the local area on site (Bennetts Point SC) which also sells locally caught seafood, usually shrimp, off season it is frozen.  This isn't your upscale marina it is a small working seafood dock in rural SC but please don't pass it bye just because it isn't fancy.  Keep to center when entering Mosquito Creek.  I would advise calling ahead several days ahead and the day of arrival just to make sure.  I had dockside power for my battery charge, 2 100 foot extensions cords!  Don't expect an attentive dockhand.  Current tends to push you onto the dock and definitely dock bow to the current it is swift.  When I docked there I docked like a tug to a moving ship: Power to the dock and cut power as I jumped on to secure a spring line!  Overnight or weather stays only not a destination you know.
Pat Banyas
Marguerite