People seem to hover near the highway, hugging the convenience and accessibility to services they offer. Unfortunately, private campgrounds that cater to RVs also hug the highway. The trade off for ease of access to the highway is noise – the constant, whirring and roaring of engines and tires on concrete. The KOA in Salina where we stayed literally borders Interstate 70. I met a woman who loves staying in KOA cabins. If her cabin had a back door, she could have stepped out it right onto the highway!
I, on the other hand, have a LOW tolerance for noise pollution. On this stretch of our journey, we’re focused on getting from point A to point B, so it’s the price we pay. When our travel isn’t dictated by a schedule, I’m going to seek out campgrounds in quiet natural settings, away from the roaring road!

Bruce and I stayed at KOA’s on our trip west in 1993. We stayed in the cabins and they were quite nice. We weren’t in any that butted up against a highway.
There are 2 requirements for a KOA campground site: next to a highway &/or next to a railroad track. With one exception. Try the one in Goodland Ks. Exceptional in all respects. Iowa state parks are exceptional. as are South Dakota.
Glad to see you are making progress. We are home for a spell, but winter plans are yet to come.
Vroom-vroom! Chug-a, chug-a!