Limited storing space if I purchase a T@b

My garage is a one car oversized garage and I've measured the space where I could store my T@b if I purchase one however being that the house was made in the 70's, the garage door entrance is 5-10 inches shorter than the height of a T@b, so my question is, in order to get it into the garage, would taking the air out of the tires be smart?  I wouldn't have the money to store a T@b offsite nor do I have room on either side of my house.  My other thought is, I could have a garage door company expand my garage entrance door higher and re-adjusted the opener so I could fit the T@b in. 

I need to have a good plan so I can convince my boss(I mean wife)that purchasing a T@b will create new memories that will last forever when we go camping.  I'm new to the RV/Travel Trailer area and still learning all about them.  I apologize if my question above is not a good one.