I need to change a propeller. Instead of paying for a haul-out ($500), I have the option to use the seawall and grid system for free. The only issue is the grid beams are 8 feet apart (railroad tie beams) and the keel is at most 7 feet long. This leaves the precarious situation of placing the boats keel on the center of gravity (or balance) on a single grid beam as the tide goes out. The attached seawall is very robust and meant to be used by larger fishing boats to dry out so securing a line to it can be done safely. My boats keel is just too small to hit two beams (preferred). Has anybody tried this, Is it tipsy fore and aft? Any advice or things to watch out for? Thanks....Tim