Oh Amy ... your first big trip. How exciting! I hope you and Bobby have a wonderful time. Are you going to visit family?
I agree with all of the advice given above. I've used AAA AND Good Sam ("used," as in "had to call them!") and I also urge you not "push" yourself to drive too many hours in a day. You never know what weather conditions might slow you -- I've pulled over and camped 50 miles into a trip because of strong head-winds. I've slowed to 45 because of cross-winds. Ive banged my head against the steering wheel out of frustration.
It's important to allow enough time to be flexible.
For instance, I know from experience that Rand McNally tells me a 1,683 mile trip from my home to Monroe, LA takes 25 hours. If I'm in a hurry, that for me would be a four-day trip of 400+ miles, per day, which I know will take 7-8 hours, including lunches, refueling, dog-peeing, etc. I usually would extend that to a five-day trip for a more leisurely pace.
Also, check your tires every day before you head out. Know your proper psi. Do you have a good tire pressure gauge (not those little pen-like things)? If not, get one. Check the tires in the morning before you hit the road & also before the sun starts to warm them. When you go from colder to warmer weather, that will affect your tire pressure. Not a big deal
cold-->warm -- which increases psi -- but
warm-->cold decreases psi and you could end up running on under-inflated tires.
I assume your motor home has duallys -- do you have the
dual tire inflator extensions that allow you to check the inside tire without gymnastics? I recommend those as well.
A small but comprehensive tool kit is a great thing to have. I've had my side mirror adjustments loosen and the mirror turned inward at 65 mph. Pulled over (oh, so carefully!), tightened it with an allen wrench and I was on my way.
Oh! And if you actually get into warm temps down south and need to turn on the air ... it's cheaper (and easier on the engine) to run your genny and cool the entire house using your roof air than to use your the dash air.
In any event, have a great trip! Take pictures and let us know how it went.