INFO FOR TRAVEL
Hello puoivolare, Welcome!!!!
I tend to agree with SnowbirdInFlight and I have some other Opinions. I found you a $22,000.00USD motorhome in CA here:
http://www.rvdirect.com/classifieds/searchresults.asp?numrows=2&where=RvAd.AdPost_<=_!2006-1-17!_AND_RvAd.AdExpire_>=_!2006-1-17!_AND_RvAd.TypeID_=_1_AND_RvAd.AdPrice_<_25000__AND_RvAd.Approved=1_AND_RvAd.Sold=0_ORDER_BY_Manufacturer_ASC;
but, if you expect an older coach with that many miles to transport you around the US and then south for a couple of years you need to have some cash or other financial backup to keep it running and safe for the two of you.
I also assume you are asking about whether you can move between states easily and the answer is yes. There are no state-to-state restricting travel laws (some restrictions that relate to firearm storage in vehicels etc but hopefully you will not have the need to worry about that). You can drive state to state all you want to. International Borders will require your passports.
I prefer Diesel powered vehicles myself as they tend to get better mileage and have overall better pulling capacities and lower high-torque power (better startups when heading up the on-ramps etc...) But, Diesel fuel is a bit higher (in cost) now (it used to be lower).
Prices I have seen for Federal Campgrounds and State campgrounds have ranged anywhere from $8.00USD to $30.00USD per night depending on dry-camping or full hookups. You can park for free at some Walmarts and a few other areas. Camping limits at most parks are 16 days.
As far as emergencies, there can be any kind anywhere. You can have engine problems, drive train problems, wheel problems (the motorhome is a vehicle so any vehicle related emergency can occur) AND then there are the motor"home" problems such as Propane connections (leaking, getting old and rotting, etc) or Heater, Refridgerator, Electric (both AC and DC) Plumbing both High pressure (city hookups) and tank (pump) related. Cabinetry, Stove, Oven and regular emergencies/maintenance and so forth. All the things you normally have with any household plus the extra stuff. Or, with proper preventive maintenance and care you may not have any emergencies.
As many people here can tell you, packing two of you into a smaller place on a continuous basis is also not easy and can become an emergency in itself.
Other expenses will include your meals (of course) fuels (propane as well as gas/diesel) regular care an maintenance items, any extras you like for daily usage. ALSO, you will want to stock the motorhome if it is not already with linen, pot/pans, bathroom items, tools, utinsels, all the necessary to live items.
Also, if anyone else can think of all the stuff I have missed then lets get with it.....
However, in spite of all of that I am a believer in the RV lifestyle and I love it!
Remember however, that all of this is just IN MY OPINION! (IMO) I could be wrong. (I apparently just like to talk.)
Anyway, Welcome and Hope you are able to do what you want to.