I have a 4 inch BDS and haven't had any issues in parking garages. That being said, I generally avoid them if I have another option, but that has more to do with the width of the parking spaces as opposed to the height of the garage. Keep in mind, you're not necessarily lifting your entire truck by four inches. e.g., you might lift the front 4 inches, and the back 2.75 inches. And, the height you gain with tires should be about 1/2 the increase ..... For example, if you go from a 33 inch tire to a 35 inch tire, your truck is not sitting 2 inches higher. Plus, a lot of tires aren't really the height indicated. My 33x12.5 are not 33 inches tall - they're shorter. Likewise, I looked at a 34x12.5 from BFG, and it was actually 33.5 inches. There are folks on here with a ton more knowledge on this stuff than me, but those are my observations FWIW.