Some pro's and cons to the 120 vs 12 volt pumps. Like you we love NASCAR tracks and are planning to hit more than a few this summer. The second year we went to Charlotte I added a second 60 gallon water tank just so we didn't have to call to be filled (We were on site for both All Star and CC 600). I originally got a 120 pump for that tank and piped into the water system. It was a great idea until the night before the CC600 and the main tank ran out of water. It was late at night and the generator i had then was pretty loud. I didn't want to annoy my neighbors so had no way to flow the water. I switched to a 12 volt for the second year and actually put a 2 way switch so i could turn on inside water or outside depending on level.
We have since replaced the 5th wheel with a older MH and I plan to move this tank to that also and leave the 12V pump. The other advantage is if we are traveling i can still pump water without the need for AC.