"...How can mail be handled while on the road..."

We have a friend forward ours, we pay her a monthly amount for being the rental agent for our house, pay the postage for those flat rate boxes, and she does the rest. Lacking a trustworthy/willing friend, there are those mailbox stores ("Mailboxes r Us" types), that will give you a mailing address, and forward your mail for a fee. You can google "mailboxes" and get a lot of hits.

You will find that county, state, and federal campgrounds are much less expensive than the KOA's (which we never ever stay in). You can camp for free in national forests and on BLM land. Usually no facilities, but FREE. We have stayed in USFS campground that were free and had firerings, tables, and outhouses. Altho they are usually designed for people with RV's, you can subscribe to Workamper News (http://www.workamper.com/), you get a bi-monthly magazing and daily e-mails about jobs all over the country. Some are volunteer only, but many include pay. Most offer full hookups for the RV, but some have actual housing. We prefer to volunteer at state and federal facilities, but have done the workamper thing also.

My guess is that it couldn't hurt to have a national chain on your resume, many will allow transfers all over the country, which could come in handy...