I'm taking a different approach to answering your question. I actually asked my wife. We live in an RV all the time but still go camping in a tent via motorcycle, bicycle, or foot.
My wife says, before she can have much input she needs to know how much of a girly-girl she is.
A woman with full face makeup, hair done, lotions, perfume, and hates any temperature other than 72 degrees, 18/7 is a 10 on the G-G scale. If she can't take her helmet off with out touching up hair and makeup, you had better save more money for a 3 month MC trip. She will need an airplane ticket home.
If she understands spending 4 nights a week in a tent by a babbling brook or near the rim with perfect sunsets is an experience not to be missed, she is a 4 on the G-G scale. Get a trailer (you'll need it unless you like doing laundry every other day), best tent, and sleeping bags you can afford, and go for it. Ron had great input about equipment, and Bob Morrow was right about a couple of nights camping and couple of nights in motels. Strsout tells it right, learn as much as possible before you hit the road.
Be careful with air mattresses in cold climates (high altitude) with out some insulation between you and the air.
Of course none of us are married to a 1. Hair under the arms, on the legs, and dreadlocks. The dreadlocks are the only thing that gets me, not that there is anything wrong with dreadlocks.
Let her know that there are some fantastic places the government has not allowed them to build motels, YET, but you can still pitch a tent.
Two more things. First,don't make an itinerary so hard and fast that you can't add a side trip to some great place you found out about last night. Second, don't try to see everything in 3 months. Every couple of weeks plan to stop for several days and just lay around and smell the roses or coffee.
Vicki and Rick