The Raptor
http://www.mygliderwheelsandmore.com/
and Custom Cruiser wheels
http://ccc.cccruiser.com/
don't fit through the doors on a brisbane, however the The Stealth does
http://atticworx.com/
I have one of each in my brisbanes, it's no big to get them in and out really, I just take the top off and put them in through the top, or slide the bottom grate out and put it in through the bottom.
I am loving the Stealth mount tho it's the easiest of the 3 to put in and take out by myself.
As I said there are pro's and cons to each cage. For some of us those pros and cons are different, depending on our space and personal preferances.
I've had both the double critter nation ( DCN cage) and Brisbanes. For me....
I don't have ceiling height so the DCN didn't work great in my space. Initially I did like the bigger doors, it is easier to get toys in and out and clean etc...
and for my bonded gliders they'd be great.
However, with new gliders I found the doors to be a pain, you open that big ol door and someone is going to come flying out of it. It's easy access for you but it is also easy access for the gliders. For that reason I prefer the Brisbane door size. Yes they are smaller but with new gliders you simply hang the sleep pouch on the door, easy access to the gliders without stressing them out or you out and less flying out when you open the door to do other things.
The latches are better on the DCN I loveddddd those, there is no mistaking if the doors aren't closed and latched properly. But for me and my needs that was the only plus.
The other benefit of the DCN over the Brisbane is you can easily add another unit to them and make it a triple critter nation or add another double to the back side and double the entire cage space.
You can add onto the brisbane as well but it needs more modification, which aren't hard but is more time consuming.
The other big difference between the two are the bars. The brisbane bars are vertical, the DCN are horizontal. I prefer the vertical but thats a personal preference, gliders maneuver just fine with either of them.
Personally I feel the brisbane is a heavier, more durable cage than the DCN and holds up better longterm to deep cleanining. I've had mine for 5 yrs and 2 were used before I got them. I don't have a height issue with these cages I can fit 3 comfortably with a foot n a half space between them in my living room.
The congo and madagascar are made with the same wire the brisbanes are, also heavy and durable just different dimensions.
If you go for the DCN make sure it's not a ferret nation cage, they look idendtical but the ferret cage has 1 inch bar spacing.
The Midwest Critter nation or Double critter nation are what you want to look for they can be found online OR All living things multi level small animal cage at Petsmart, they are the same cage sold by 2 different companies.
Any of these cages are a good choice
Kelly is a personal friend of mine and not your average breeder, She breeds for the pure pleasure of it.( You can tell her Carla sent you to her)
Kelly has mentored many new owners, and is very pationate about gliders and their care. If she doesn't have a glider (or 20) that are what you want she also has connections to other breeders and rescuers in that area and will be happy to point you to them.
She is also a valuable connection for vets in the area. I think she uses two different vets depending on the medical needs. Her glider goal is to one day have a facility that not only sells/rehomes gliders, but also everything you'd need for them and ongoing support afterwards. She is very much about education and ongoing support which you won't find with many breeders.
She is one of the most giving people I've ever met, but she will talk your ear off so be prepared to spend some time with her whether its on the phone or in person