Mission Accomplished! I finally got all of the parts rounded up and found the time to rent the concrete saw.
I used a 14" diamond tipped walk behind concrete saw to cut out two 12" x 48" slots in the floor. I did not recall them putting down wire mesh when they laid the floor, but I can now confirm that it's in there and that it makes it really hard to extract.
The final result, I've got 1/2" clearance between the garage ceiling and the AC, and 1/8" clearance when lifting the back shell over my workbench. I forgot to measure that part out ahead of time, but sometimes you get lucky.
For the tongue, I set the angle iron that supports the propane tanks on a tire dolly (Harbor Freight part #
67511). This left the bottom of frame tubing 6.25" off the ground after I sank the tires 9.5" below the surface of the garage floor. I tried setting the jack post directly into the dolly, but the post did not retract far enough to make this configuration work.
All of the leveling jacks still have about an inch of play.
Since I had to put the unit in nose first to get the door to open on the correct side, I built a pivoting tongue that fit into the hitch on the back of the camper. My unit's rear hitch is plenty sturdy, some of the newer units supposedly have a lighter duty hitch so be careful if trying to re-create my configuration. I scared myself a bit when trying to pull the camper out of the hole the first time. About half way up, my minivan started loosing grip. The squeel of the tires was enough to elicit a visit from my wife who was not completely on board with the project and the mess the concrete saw made the night before. But after a bit of research I found that taking off the parking brake on the van tends to give one more pulling power.
Eventually I'll get a couple of metal plates to cover the holes in the floor when they are not in use, and I'll have some liners formed to fit into the holes to make sure that the clay does not try to settle into the holes, but this is good enough for today.
Thanks to everyone for their input.
Here's an alternative link to a page with the pics. You may have to be a site sponsor to see them.
http://www.trailmanorowners.com/foru...php?albumid=83