We want to stop off in OK city and visit the outside memorial. Is there RV parking in the area? Is there enough room downtown for a 36' fiver?
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There isn't parking per se at the memorial. You just use the spots along the streets in downtown OKC. If you go over a weekend or after say 7pm on a weekday, the downtown traffic is almost nil. It may take a while to find enough room for an RV, but it's doable.
You also might look into the Bricktown area. I think they have shuttles and such that move folks around downtown. In Bricktown there is a BassPro Shop with lots of parking.
When are you planning on coming? There are some streets North and East of the Memorial that, during non-working hours, have pull-in type parking that you could use multiple spots while visiting the Memorial. The Bass Pro idea is definitely doable, but it's a rather long walk to the Memorial, but if you unhooked there is plenty of room. There is even a lot on the South side of Bass Pro, accessable from the Bass Pro lot, where I've seen plenty of Motorhomes and 5ers parked.