I did spy some spam for mypccase on the web so it appears they are trying to do SEO too.
In fact, they didn't answer this last year at http://www.tomshardware.com/answers/id-1993892/server-rack-choices.html so again they failed you.
Why not find a company that will talk to you?
Try a Newegg business rep at http://www.neweggbusiness.com/s/server-chassis/id-412
I'm looking for recommendations on a sturdy server rack. Budget is $1600 (just for the rack) and I'd like to use these cases unless someone can recommend better ones for a similar price. (http://www.mypccase.com/chrmrasechw5.html) I'd like to be able to fit 4-6 of these 4U cases. I'd also like a ball bearing rail system if possible so I can easily slide the cases in and out. However, I’m not familiar with the reliability/sturdiness of these sliding racks, so any advice on that would be much appreciated as well.
Thank you for any input!