Thanks. I went out to the airport this evening after work and measured; there isn't any way I can get a crate that wide or tall into the cabin. The 30" length isn't a problem, but the width and height are. The small folding crate that I have is 16" W x 16" H and that just fits into the back seat through the front door. The larger crate that I have is 21" W x 24" H and it won't fit at all.
The large folding crate that I have I am able to set up in the cargo area since it collapses; once I get it into the aircraft I open and set it back up. If there's any way that we can make that work then we can have a go, but the hard sided crate simply won't fit. Sorry.