The Cadillac Escalade and its siblings the GMC Yukon and Chevrolet Tahoe/Suburban are popular full size SUV's. Installation on these models is more or less the same and most installers will run across the same difficulties. Here are some of the things to look out for when installing in one of these full size GM SUV's.
Accessory power is tricky as the vast majority of fuses in these vehicles are constant power. Some have accessory fuses while others may not depending on how the car was configured. The easiest way to get around this is to purchase a phantom ignition power module which will mimic a switched power source while still letting you use the fuse box. These typically have an output limit of 3A or 5A so if you're installing a battery pack, you will need to build a relay to make it work. There are multiple fuse boxes in these cars so you may want to check them all to make sure you have accessory power.
The other thing to look out for is the rear liftgate which has a window that separates. You don't want to mount the rear camera directly to the glass as this will result in some unsightly wires when the glass is opened. Instead, mounting it on the plastic trim panel that's fixed to the liftgate will allow much better wire management and give you more or less the same view. Alternatively, if you don't want to go through the hassle of running the rear camera wire through the loom, you could also attach the camera to the trim panel on the inside edge of the trunk which is also a hard surface. We don't like mounting here as is it's a few inches inset so the view would be compromised. The other issue is that the camera could get knocked off when loading larger items in the trunk.