Ha ha ha, yes I went from the tiny Ms"B"Haven to a big ol' diesel pusher! Just couldn't figure out how two people and two Chihuahua's could live full-time in Ms"B"Haven.
Regarding budgets and expenses, you can take a look at my blog to get an idea of types of expenses we expected to have when we set the budget and what we are actually spending. Good grief, we're going to be over budget again for the month of December. I noticed that Karen spends $200 for food - now I know why I'm so fat - I'm eating too much - we spend $600 a month for two of us. Don't forget maintenance costs - we really under-estimated those.
From all the blogs I continually read, I really believe that people who really want to have an RV lifestyle, part-time or full-time, will find a way to make it work. Our expenses are high because we don't work - but I'd consider sending Roger back to work if necessary to keep on with our full-time lifestyle! Boondocking can also save a lot of money - we hope to do some of that when we head west.
If I can answer any specific questions about our budget and expenses listed on my blog, just send me a PM.