mate Navigator Carrier with Antimicrobial Protection,

Q: Is there one or two locks on the door? Is this the most durable one from Precision?

We just bought this XL crate from Prevision Pet, and the ad that induced me to buy it did say there were 2 locks on the doors. Nope, it ONLY HAS ONE SLIDELOCK on each door. Our 85-pound, 9-month-old Lab/Pit "puppy" (who is crate trained since he was 8 weeks old) figured it out the second night, jiggled the door open and ran amok in the house. The next night, I made sure those 'hooks' were securely in place and that the slidelock was fully engaged. Didn't do a bit of good. Now, I have to use multiple carabiners to keep the door from lifting off the hooks and the lock jiggling into an open position. I am NOT a happy camper and it makes the dog nuts when he's in the crate and I'm either trying to put him to bed or get him out in the morning. If the crate wasn't so dreadfully heavy (80+ lbs), I'd return it. It would cost a fortune to ship it back. Not pleased by the incorrect product description.

Q: Is there an opening through the top as pictured?

There was no opening in the top of my crate. There is a large opening on the front and one on the side but nothing on the top.

Q: Can one add castors to roll the crate easily and safely if need be? If so, what castors are recommended?

If you are comfortable drilling through the floor and have a way to cap the screws/bolts to keep the puppies from hurting themselves on them - I guess you could. But I would recommend building more of a dolly (frame with 2x4s and 4 casters) and putting the cage on top of it, that way the flooring is supported in the middle and doesn't sag. And the bigger the casters, the better.