As the others have said - really nothing near Plano.
My daughter and grandkids live there. Son and grandkids in Wylie. We lived in Wylie for several years. Unfortunately the unattractive East Fork COE park at Lake Lavon is the best in the area all year.
Summer months we go to Clear Lake on the north shore of the lake in Princeton.
There is a fairly nice looking RV park in US-75 north of McKinney - Texas Star Resort. There are four private campgrounds on the west side of Lake Lavon near Lucas - none have impressed me enough to even check rates and facilities.
Destiny RV Resort in Corinth on I-35 north of Lake Lewisville is very nice. On par with the Vineyard in Grapevine. But the commute from either would be awful.
Don't look at anything which would require traveling on US-380 between Denton and McKinney. Horrible traffic and a thousand stop lights.