A few years ago a friend had this situation. He had an 18 foot Sea Ray
with a 4.3 Merc. outdrive. So the weight should be comparable to yours.
He used a tongue dolley that he got a Boat US. Don't recall the price,
but it wasn't outrageous. He was able to move it around the drive and
garage by himself. The area was all concrete and level, tho, and he's a
pretty big guy.