I would definitely stay in Garner vs. Parkside so you can really enjoy the setting - even if it's only for one night. Parkside is fine; it's just more of an "RV Park" with close spaces, as opposed to a "campground" with lots of room. If you've never stayed in Garner, you'll really like it.
Also: Palo Duro Canyon is really nice but I agree it's not a good overnight stop unless you just happen to be driving through Canyon, TX.
Also liked Santa Fe Skies RV Park in Santa Fe. And BTW - there's a good public parking lot in downtown Santa Fe (1 block from the plaza) that has big spots for RV's. We drove our motorhome down there - a bit tight in places, but there were bigger coaches in there too. You might even be able to boondock in there overnight, if you're so inclined.
2002 KZ Sportsman 2405
2005 Duramax
1996 Foretravel U295