Deciding What to Take on our Trip

Sheila's thoughts......
How do you plan what to take on a 30 day RV trip?  You need everything including the kitchen sink as Mom would say, so thank goodness the RV does have that all ready! Now we are going to be gone the whole month of September so the weather could be hot, warm, cool and even down right cold in some of the places we plan to visit.  I have always had a tendency to over pack but I think I need to try not to do that this time, although we have plenty of room in the RV after 30 days things could get a little cramped.
Besides clothing, food, and the essential personal items we also have to take along a computer (or 2 or 3) and a printer, paper, work files, and cell phones so that we can stay in touch with the world, family and unfortunately work!! We also need maps, touring/sightseeing guides, RV campsite books, and much, much more.
We have also tried to figure out if we need to take some other type of transportation just in case we have a flat tire or we don't want to drive the RV everywhere.  We looked at bicycles, 3 wheelers, scooters, mopeds, wheelchairs (since we are so old and feable!) and the best would be a Harley Davidson motorcycle.  So then we would not only be the RV sisters but we could be the RV Hog sisters!  What a hoot! Or should I say what a snort!
Anyway we are now in the process of making our list of items to take and who takes what so we don't duplicate each other.
Any suggestions would be greatly appreciate, but keep the list short.