I will be adding a 3rd dog to the pack in about 6 weeks and am looking for suggestions on getting 3rd crate into my truck. I have a 2011 Silverado crew cab with the short box, I have a drawer system with a platform over the wheel wells giving me the greatest amount of flat space in the bed and a topper. The topper's drivers side windo flips up so I can access from the side. Any recommendations on crates that fit well in this configuration or suggestions on how to configure crates is appreciated. I have two Pet Porter (Large I believe) crates currently.