I would line them up just forward of the front cross bar so any water that may get inside would drain back. I would put old mats under the aft part of the hulls that are in touch with the sand and secure it with a bungie cord. That gel coat comes off so easy and sand is just so abrasive. ( If your 20 is on the beach a bottom job or reapplying gelcoat is just a matter of when ) Everyone is more careful with your hulls after a bottom job, especially if you do it yourself. The spot they seem to wear down first is just fore and aft of the dagger wells.
When I would come in from the Atlantic and hit the beach. I would let the surf take me as far as it would take me in , then run up get the beach wheels and lift the front of one hull to get it started in a cradle and sort of scoot it down, moving it like six inches at a time on each hull, holding onto a 6 ft. line I had attached to the dolphin striker to pull against and doing a single leg press against the cat trax axle. I would push it back just as far a I could to comfortably pick up the boat at the rear cross bar. Then I disconnect my tiller cross bar and get that out of the way, pick up the back end, pull my main in and literally use the wind to go 40 yards up hill on a fast walk to the edge of the dunes out of tides way uncleating the main and turning slightly into the wind when I wanted to stop. When you single hand as much as I do you figure this stuff out. This works great in the Atlantic with a SE wind.