Mark, for what you describe I would either expect to spend more for casters (these are what I use when things REALLY need to stay put
WoodRiver - 5" Caster, Double Locking, Swiveling with 4 Hole Mounting Plate
They're double locking, so wheels neither roll or swivel when they're locked. Most of my shop is on either these or the Rockler mobile bases
Rockler Power Tool Mobile Base Hardware
Instead of the 1-1/2" wood connections on the rockler stands, I use 1-1/2" square tube - My PM66 saw and 2 of my router tables are on the Rocklers along with my woodworking DP and a dead upright freezer with a small light bulb in the bottom for things I want totally rust and dust free - the third router table, band saw and a couple other stands use the woodriver casters.
My 12" helical head jointer weighs right at 1000 lbs and the beds total 85" long, I'll have to fab some "underslung" 6" casters for that in order to keep the tables low enough to work for my plan to have 10' minimum in and outfeeds for the bandsaw, 2 jointers (other one's a 6" powermatic) and one of my planers in minimum floor space (I'll only have enough room for the base of that jointer to be 1/2" off the floor.)
I made the mistake of believing Shop Fox on one of their "1000 lb" mobile bases quite a while back; dang thing wouldn't even roll good when it was EMPTY. It's still sitting in a scrap pile somewhere I think. Never again...
If you're gonna "cheep out" on casters for a work bench, better plan on some kind of drop-down feet, or else wear roller skates so you can keep up with the bench
Just my :2cents: - Everybody's got their pet peeves, one of mine's crappy casters/wheels... Steve