Hi Rainjer, jdarkoregon, fornesto, and Andrew,
Thanks for the responses. I was indeed thinking that it would be neat to have that extra clearance underneath when bouncing along on bumpy roads. I love the picture of the Iowa Boys trailer (ingenious), and I think the canvas idea has great potential...maybe with some stitched pockets for wood slats..like a modified roll top desk The corners could be zippered or snapped or maybe be closed with Velco. Then, at night you could just pull them up flat underneath the mattress. A drop down center well has all kinds of interesting potential...heater, cooler, dog bed, or ??
The Fred Meyer idea is great, too. I'll check it out. Also, I just heard about a place in Seattle called Alaska Steel and Copper (or something like that). I'm going to check it out as well for parts.
This planning stuff is great fun.
Thanks again.
Kris