We have traveled part time for 16 years - out 2-3, sometimes a little more, nights a year. I log everything - my engineering mentality I guess! :-) We stay at FHU places, about 98% private rv parks. In the last 3 years we have averaged about $36 / night. And nearly all meals are done at our rolling condo. We don't eat out much - but we don't eat out much when at home.
And - very important - OUR place. Our bed, our sitting area, our kitchen, our shower and even our toilet, etc. Our "home". Our peace of mind. Hard to put a price on the comfort of all that.
We just spent 68 days on the road back up to - mainly - the OR Coast again. From south of Tucson. Stayed on in FHU private RV parks. Average cost of $37.22 including 5 nights at a great place between Bend and Sisters, OR at $52 per night. Meals? Not much greater cost than at home (except food prices along the 395 corridor in CA).
Bottom line - will do it as long as we can.
Love it.