Mount casters on a block, mounted on some threaded rod. How much
adjustment do you need?

I think I might not have explained this clearly. Let me try again.

The outfeed table will not be stationary in one place. The woodshop is
my single-car garage. I intend to move the car out in day time in
weekend to work on my projects, and then move the car back at night. I
cannot leave the outfeed table in the middle of the garage. I intend
to move it to the center of the garage and unfold its legs when I work
on my project; and then fold its legs and stand it up on its end when
I am done for the day. This means I need to move the outfeed table
around. Today, it stands on one spot. Tomorrow, it may move to a
slightly different spot.

The fact that it will not always at the same spot, and the fact that
the garage floor is "very" uneven. If I move the outfeed table two
inches to the left, I will have to re-adjust the height of the outfeed
table; otherwise, the top of the outfeed table will not align with the
top of the table saw. I can adjust the height of the outfeed table
every morning; but I want to do this easily instead of using a wrench
that can get old very quickly.

I find something like what I want in a woodworking catalog last
evening (from WoodTack or something like that). Is is designed for
constructing a mobile router table. It has wheel, and its height
adjustment mechanism is like the screw-mechanism in a bar-clamp --
convenient enough. But that costs something like $60 for a set of 4
stands. I have a feeling that anything similar will not be cheap -- oh
well...

I guess I may have to settle for other cheaper alternatives, like:

1. Put an inter-locking mechanism in the rear of the table saw to
lock it with the outfeed table. At least I can get one side of the
outfeed table to be perfectly even with the top of the table saw, and
I just have to live with the fact that the other side of the outfeed
table may not be perfectly level.

2. Level the four small spots where the legs of the outfeed table
are most likely to stand on. Make sure those four spots are perfectly
level with one another, and leave the rest of the garage floor alone.
Highlight those 4 spots with spray paint. Then, I can use the
wheels-with-thread that the other newsgroup member has suggested, and
I only need to adjust them once, and don't need to adjust them for the
rest of the life of the outfeed table.

Seem like alternative-#-2 is what I will most likely do.

This sounds like a plan to me.

Jay Chan