Thanks all. My husband understands the wheelbase issue. He test drove the escalade and it didn't fit what he wanted anyways. The cheapest, most efficient route would be to put a cap on the silverado. We have 3 dogs, so can't fit 3 large crates in the back but they weren't in their crates inside the truck either. We'd have to modify the rear window to a slide window to allow air/heat into the topper too.
We love our Silverado. It's well built, and my husband has it tuned transmission and motor wise right where he likes it. He hates the look with the topper, and I don't blame him. Either I'll have to cave and get an SUV with a longer wheelbase or he'll end up caving and getting a topper installed.
And I didn't take offense to the "master tech" comment. He's an automotive guru, you'd be hard pressed to find a way to insult that.