Hitch-hiker/Float-On floating style trailers

[erebus]

So for my new to me 23 Sceptre I was able to score an original Hitchhiker trailer perfectly set up for the 23 Seacraft hull.
Fits like a glove.

I put the boat in last spring, with no problems, but...
When I went to haul out the other day I backed the trailer down the ramp and the damn thing floated right up off the ramp!!!
I was still able to drive the boat on OK, but the boat was drifting one way, and the trailer was drifting the other, WTF?
Is that supposed to be how they work?

The trailer has really tall guides so I was able to kind of center the boat on the trailer and then have my wife drag it out, but I couldn't believe it when it was just floating there.

Is there a technique I'm missing here?
Maybe don't back her in too deep?
Strap the boat to the trailer before driving up the ramp (while everythings still floating)?
Use a shallower ramp?

I work for a boatyard and have no shortage of experience hauling boats, but a floating trailer was still a new one on me. Must not be a New England thing.

Any advice from the big Seacraft brain?
Other than the floating thing, the hitchhiker is a sweet trailer.

How you paint your bottom when you have access to a big-ass forklift.