Everyone has said this before, but I'm going to say it again because it's very true: no one can give you an accurate dollar amount because no one else is you.
Generally, if you don't change your spending habits you'll probably find that it costs you the same to RV as it does to stay still, unless your taking on a loan for your RV, or getting rid of one by selling a house, etc. Instead of rent/property taxes you're paying for RV sites/fuel to travel. Food will be about the same, entertainment costs will be about the same (as long as you don't treat it like a perpetual vacation - if you do that it'll be more!). It'll also cost money to maintain your RV, it's a house on wheels that undergoes earthquake like forces every time you move it - things break down faster than on a regular house.
I'm a young solo full-timer in a 17' molded fiberglass trailer. I have no debt whatsoever, and I live modestly. I've had months where I spent under $700 (work camping where site and utilities were paid for, didn't fill up gas tank the whole month, didn't spend a single dollar on entertainment, didn't have any maintenance issues crop up), and months where I spent over $1,600 (lots of traveling, going out to eat more, spending money to see the sights, going to the dentist, etc).
Also as others have said, things cost more in Canada than they do here, the dollar is weaker than their currency, so keep that in mind. I also second having an emergency fund, because RVs are complex and at some point something will go wrong, it's inevitable.
Whatever you decide, good luck!