Yes it is easy to sell products while on the road. More so now with how far the ease of online banking has come.
Sell Either directly online or following actuall trade/craft shows in your RV and selling in person.
Online there are many options of having them shipped for you/receipt of payment.
And when it comes to money management paypal is 'not' the only way.
1. Direct deposit into your account for salaries.
2. Checks scanned on your printer and deposited into your account.
3. Plug in for smart phones that takes a credit card purchase.
4. Use your debit card to access bank account funds.
I've been on the road full-timing and still use my bank back up north. I can deposit checks, receive money and spend it right from the comfortable confines of my MH!
I have not seen the inside of my bank in the last 8 years!!:C