I have a Rottie and the large 48x36 wire crate with the ABS Plastic pan. AWEFUL, AWEFUL, AWEFUL. The "tough, durable" plastic pan has cracked 3 times in 2 years. The first time Midwest replaced it for free, the second time they basically said too bad and I had to buy it. Not 6 months passed before I had to buy another. There is no other pan that fits this size cage. I Tried to buy a metal one from JB Pet and it was lower quality than HVAC metal and came damaged 2 times from UPS.
Also, I have a water bottle attached to the side which drips occasionally onto the ABS pan. When I let my dog out...she brings black paw prints out to the white carpet. =(