Bill,

Assuming a smooth floor it is very easy to do. This solution is a little
messy but I've used it many time to move large military trailer mounted
shops sideways to fit into tight spots..

Stop a few inches from the rearward destination. Spread some grease (GAA)
on the floor behind the tires. Back the tires onto the grease. Unhitch
making sure the dolly wheel is pointing in the proper direction for sideways
travel. Push the boat/trailer sideways as required. Clean up the residue
and chock the wheels.

Not very elegant but it's easy and the cost is just about nada.

Butch
"Bill Kearney" wrote in message
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I am building a new house, and have made provisions for my 23' chap.
However, the beam length is to wide. I will need to move the boat side
ways. I have seen a device that is used for cars to move them around,
called skates. Is there such an animal for trailers? Is there a rolling
plate available? Many thanks.

Are you looking for these?

Wheel skates work great for a car in a garage on a nice smooth concrete
floor. Is that where you'd be keeping the boat? Otherwise, how smooth is
the surface on which you need to move the boat?