After much work and frustration training them in the house, we’ve officially gotten the grrrls into the CX-9 2 days in a row, using the pet ramp. The younger dog grasped the task immediately. The older dog was still not happy with the process, trying to go off the side, etc. But with guidance and a firm grip on her harness, we got her in.
Getting them OUT was a bit more challenging. The older dog was trying to squeeze out the fap in the door before I even had the ramp back in place. And the younger one was practically stampeding over her housemate once the ramp was properly deployed.