To enhance Bob and Matt's responses , if you beach [on sand or rock ] alot ,with a steep shore and you do not run totally ground with the motors [still off of the bottom], Keelguard [should be called entryguard]devices are very good . If properly applied, and with a properly fitted trailer ,there would be little interaction for loading and unloading .It would just boil down to how much bow contact you have with whatever shore line you are nudging up to .Really not worth worrying much about .
Marc