Glen, I certainly wouldn't drill holes in my new Mountain Air. Are you covering the tires every time you stop, or only while stored? I also have the white covers. Mine are the type that have extra material at the top that drops over the back of the tire ( I believe they're Camco brand).
I only install mine when the coach is at home between trips. The biggest secret, I put them on before I air down. On my style, I slip them over the tire and then pull one side down and then the other, wiggling them on. I figure I can put one on in about 45 seconds.
Maybe the style you're using is the issue.
Don & Mary
2019 Newmar Dutch Star 4018
2016 GMC Canyon 4WD Crew Cab