Hi- we have a Garhauer unit motor lift
(davit) on our boat, and are quite happy with it. Our experience with Garhauer has been that their products are top quality. A link to their site is here: Garhauer Marine Hardware -8782158
A picture of their motor lift
incorporated into our arch is here:
towards the bottom of the page.
Another nice thing about the Garhauer lift is that it is easily removable.
And for the disclaimer... I have no affiliation with Garhauer except as a happy customer.