$3500 should be more than enough for the expenses you mentioned...you could do it on a thrid of that or less if you really wanted or needed to...or you could easily spend 2 to 3 times as much. I don't know about you, but our food budget is $400 a month for 3 of us and was the same when there was 4 of us. That leaves over $3000. You should be able to camp an entitre month at state park type of places ($25/night) for around $750...double that ($50) for private parks and you are at $1500...that leaves a $1000 for gas...If you can get gas for $3 a gallon..that would be 333 gallons...even at 8mpg, you are talking over 2500 miles....if you plan to go from coast to coast and back again in a month,...then no, it will not be enough...but it would be enough to go from the east coast to the west coast once...You can save by joining discount groups and overnighting in walmarts, truck stops and etc every now and then...and then there's boodocking... I follow a guy who lives in his motorhome on about $600-700 a month...very doable...