Our average allowance for the year is approximately $700 a month for lot rent as full timers. If we wanted we could get that down to less than $400 a month.
Our summer base CG where we stay off and on for about 4 months is $325 a month. We travel about 2 months out of each year and those months rent average anywhere from $900 to $1200. Our Florida rent is in a upscale resort for several months and it is about $1,500 a month.
So you can actually keep your monthly rent about as cheap as you want. I know fellow full timers that mix in some dry camping and use a lot of state parks and get by for an average of less than $300 a month. Ours is more because when we travel we don't dry camp and when we winter in Florida we like being within a mile of the beach.