Here in Montreal, one of our electronics parts shops stocks these guys.
This is exactly what I have my 58 sitting in right now. If yer on a budget, it might be worth a try. I got mine through eBay, though I know Sigler Music sells them.
Pros:
12 spaces on top and like 11 on the bottom
Casters are good quality
Price
Cons:
Thin-guage steel for members...the rack is kinda shakey with 100lbs. up top...helps when you get the lower 11 populated...
Rack rails are the square-hole type requiring the additional cost of T-nuts, plus they are a royal PITA to install compared to drilled and tapped rail
Overall build quality is made-in-China...lotsa things you gotta ignore and just be happy with...locking pin holes don't line up too well, had to straighten one of the rails...etc.
I recently picked up a Tascam CS-607 on eBay for relatively cheap that needs a couple parts. Got it in the shop now and have it assembled...
totally different animal...
totally It is too bad that it only has 2 spaces down below but everything else works
so much better and it is
much heartier. I had assumed this when I got the budget trolley, but now I know.