ok since the pooches have been corral'd and i MIGHT just need a dirty beverage some time...
here's a bit more info.
after purchasing a vehicle permit and rv sticker you will have access to the NO UTILITIES sections in most state park campgrounds...
these are typically called the primitive sites and while many are for tents, they also will accommodate rvs.
at hillsdale that loop is called rabbit ridge
the rest of the state park there has water/electric which is useful when the a/c is needed.
the dump station has fresh water too, so one can fill UP with water and DUMP even while camping in the primitive loop.
a couple of the loops have "premium sites" because of more shade trees but this only adds 2-3$ to the utility fee.
that's a great place to go for you and a few shake down nights of camping.
also the rv dealer/shop off i35 in olathe is closeby for supplies, emergency services and LP gas.
but the lake is still YOUNG so the flora/fauna around it isn't well developed yet.
also it's SO close to the metro area that a lot of people use that area.
even though it's a hour more towing, the state park at pomona (vassar state park) is MUCH MUCH more remote and isolated from the metro zone.
in fact you will think the park has been abandoned or is a ghost town most of the year...
that park is 40+ years old so the shoreline and trees and campsites and trails are MATURED in a good way.
some of the loops have FULL HOOKUPS and others water/electric only or primitive.
at night the stars are BIG and IF it's not a 3 day holiday (memorial/the 4th/labor)...
it will be primarily YOU and the camp host and the park rangers.
so i like that area a LOT for quiet camping near water and with ALL the normal state park facilities to use.
the small towns around there (for groceries) are friendly and need the biz (check out osage city/overbrook/lyndon and vassar)
MELVERN lake/state park is similar but a tad busier during fishing season and another hour southwest.
almost ALL of the LARGE ks lakes, also have army coe campgrounds...
these are typically closer to the spillways, reservable ONLINE and cost more.
ok, for TOTALLY FREE boondocking check out douglas county state fishing lake...
they've recently FILLED the lake and restocked it with fishies...
and there is a FREE camping area there.
this is very close by u and near baldwin.
go there most weekends and it will be YOU and a few guys fishing.
go mid week and it will be JUST YOU.
many of the counties in ks have a "fishing lake" with free camping.
these show up on the state park map but are NOT really state parks with fees and so on.
almost ALL of them you would find very sparsely populated.
i'm not a huge fan of tuttle creek/milford.
it's a NICE area but gets a LOT more traffic use than most other ks state parks/lakes...
so does perry near topeka and the clinton lake at lawrence, and it because ALL 3 are near population centers.
realize "busy" and "traffic" are relative terms and almost ALL camping in ks is UNcluttered relative to other states...
IF headed west on i70, i prefer going to wilson.
the lake there is MUCH different than any other lake in ks and there's a great mtn biking/single track trail there...
or council grove (in the lower flint hills) which has a nice little lake/campgrounds and the historic santa trail head legacy.
but from olathe, there are dozens of places to try within 2 hours of towing.
spring is a great time to hit ALL of these areas, no skeeters, no ticks, no poison ivy yet...
but there is the hail/winds/rain/tornados or SNOW to make it all more interesting...