my brother and i went fishing in his boat, a nitro. he forgot his keys. low and behold, he used a small mailbox key or maybe it was his trailer lock key. anyway, started right up. we both were in shock.

i think from your post, you are saying your trailer hitch is locked. if that's the case, just shoot it off like in the movies. lol.

if it's your boat ignition key that you've lost, start pulling all your small keys and give it a whirl.

good luck.