Finally had time to check out the tire sizes - sorry it took a bit.

The rears are Goodyear Super Terra Grips, 38 x 20.00 x 16.1 and the fronts are 38 x 12.5 x 16.5 "Super Swampers".  I ruined one of the rears a couple of years ago and was able to buy replacements from Kansas Land Tire if I remember correctly.  I do have a couple of used ones if you would be interested - don't have any wheels though.

I'm not sure what the thing weighs.  I did know at one time, but can't remember right now.  The floaters are enough to hold it up most of the time.  If it gets too soft we do this:

(PB300023.JPG)

PB300023.JPG (74KB - 399 downloads)