A lot depends.... When my wife was alive I got about 1700 a month, of which 700 went for the loan on the class A, she got 727... Now she's gone, I'm on Social Security as well, so I get more and of course my Pension goes up as well.
But that said, we were very very tight, We took advantage of membership camping (All memberships fully paid for) so our "parking cost" summers were on the order of less than 100 dollars and winter less than 200... On those occasions where we have spent a month out of systems (Not in membership parks) it's around 350/month. We shop mostly ALDI and Wal-Mart. abd dang few extras. This is a bit beyond modest.
At the end of this month I'll know how much my pension goes up not that the 50% survivor option is no longer in effect, The motor home will be paid for, and my standard of living will improve. Come fall I'll try again to get a good used car. Last one was great,, for four days.