Everyone's situation if different. I've lived full time for 2.5 years, and have I saved money, probably not, because I tend to spend money, others may not. Again, comfortable is a really subjective term, but yes, I'm absolutely comfortable because I purchased a good TT and outfitted it to be that way.
Really need more information, when you state "living out of an RV" where will that RV be located? Are you parking in someone's driveway and using their electricity and bathrooms, or are you gonna be in an RV park that requires $300-500 per month rent plus propane for heating and hot water and electricity? Are you paying cash for the RV, or will you have an ongoing mortgage expense to finance it? Will you have to pay for storage of your household goods that won't fit in the RV - furniture, tools, linens, clothing, etc.?
You can do a budget and get a good idea of what your circumstances would be. Many things are gonna be the same - food, groceries, pet care, medical and vehicle insurance, medication costs, fuel costs to drive/commute to work, your lifestyle's entertainment (movies, streaming TV,) hobbies, gifts, etc. So you can ignore those, and compare what your rent, utilities, insurance, mortgage are now and to the expenses of living in the RV - which are also rent, utilities, insurance, and perhaps financing the RV. Are you gonna need a lot of electricity for air conditioning or propane for heating?
And, there will be expenses for maintaining the RV which could be high ($thousands) or low (hundreds) depending on what breaks - furnaces, hot water heaters, fridges, inverters, TVs, water pump and more can crap out and sometimes require expensive parts to fix. Labor costs to repair RVs are astronomical! What do you do when the roof decides to leak? You may have to replace batteries or tires. Then there is also the investment in equipment to operate the RV such as waste water discharge hoses, fresh water hose, electrical extension cord, portable heater or fan, generator, etc. that can run up to $1000 or more.
There are lots and lots of YouTube videos, the this Forum, that can familiarize you with requirements for living in the type of RV you may get - Class A, camper van, TT, etc. Those will give you more comprehensive ideas of what you'll face so you can estimate a budget for living in an RV. All in all, and without knowing your expenses, if your goal is money to "move" then I would doubt living in an RV is the best way to pay for that move.