First of all, I agree with some of the comments already made about your internet needs/usage. You will not be able to depend on CG's internet service generally speaking. A Verizon package is probably the most reliable but you will pay for it. Based on what little you have said about your self employment, I am assuming you will be using a lot of GB's.
If you plan your shopping trips there shouldn't be a problem getting a 32'-36' Class A into a Walmart parking lot in most cities/towns.
The financial part of full timing is different for everyone. However, unlike paying a mortgage, residential taxes, and everything else that goes along with that, you can control you spending better while being a full time RVer IMHO.
If at age 27 you are going to start doing this and continue for years, a firm financial plan should be in order like 2oldman said. If you can control your budget well enough and still bank 25% or more of your annual earnings then you would be in excellent shape I would think.
Good luck.