I don't know what your joiner looks like or how it works but if it's going to rip up the surface....not a good idea. I made my blocks from billet aluminum and milled them flat and smooth, then used my Hutchin's handles on them...you could drive over the things and wouldn't hurt them.
The tops are easier, not as many little nooks and crannies to get into, it should go quicker now.
WIDETRACK tires? who makes those?