I guess I was speaking more from my perspective than the OP, me bad. In my space, anything on the other side of the table isn't easy to access. Just pointing out that locks on all 4 wheels aren't really a necessity, if you like them go for it. The only thing I have locks on all 4 is the flip top table where the front depends on which tool is up at the moment. The drawer even pulls through both ways. I do use swivels on all 4 corners because of the maneuverablility. As far a purchasing casters from woodworking outlets, the quality is pretty much the same. I have 3" casters from Peachtree and 3" casters from Grizzly and the only way to tell the difference is the invoice. Peachtree was $58 and Grizzly was $24.

This is a bit expensive but might fit what you're looking for. Beats a sore back.

http://toolguyd.com/benchmark-portable-work-table/

I understand your point about the locks on all 4 wheels not being a necessity. In my experience, anything on the other side of the table is hard to reach. If you like locks on all 4 wheels, go for it, but they aren’t essential. The only item I have with locks on all 4 wheels is a flip-top table, and that's because the front changes depending on which tool I'm using. The drawer pulls out from both sides, which is handy. I use swivels on all 4 corners for better maneuverability.

When it comes to buying casters from woodworking stores, the quality is similar. I have 3" casters from both Peachtree and Grizzly, and the only way to tell them apart is the mobile invoice. Peachtree's casters were $58, while Grizzly's were $24.