Thanks for the feedback so far. We would be utilizing this membership (if we got one) to have safe places to stay overnight, do laundry as needed, and burn out the kids while we explore various areas on our road trip map (so far along the I-90/94 corridor, around MN/WI, and back to Ca via I-80).
I checked the ThousandTrails website, and unfortunately they don't' seem to have any campgrounds in the area we'll be in most, so that's a no-go
Our last big road trip (before kids), we winged it and were lucky enough to get in last minute via cancellations or tent sites at National parks, or we stayed at Walmarts, rest stops, truck stops, and the like. Some days we drove a lot to get to a specific spot, with a few short stops here and there to check out local food and scenery. Other days we decided to stay at a motel so we could shower and send out email updates to family and friends. We know this will not work this time around, so that's why we are thinking KOA membership or something similar so we can plan accordingly each day and make sure the kids get enough play time as they will be overwhelmed with some of the sites i'm sure.