I have an Escalade, the same size as the Tahoe you're considering & you can load bikes inside or install a hitch mount rack easily. The CTS is hot, fast, and good looking, but you will have to modify either some type of rack to fit the pointed trunk lid OR modify your poor baby Cadillac to install a hitch for a rack. The Tahoe is a more practical choice- I love my SUV- I like sitting a little taller than most, the gound clearance and roominess. Since an 07 CTS has an insurance symbol of 19, you'll probably prefer the insurance premium on the Tahoe.- your more 'full figured' clients will also find it easier to get in and out of the Tahoe.
Happy shopping
Pat
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort.