You could go either way. I think your dads way is a lot more geared towards fixing it and preventing it while yours is just a fixing method. Someone please correct me if I'm wrong. A little story, about two months ago I was learning stick in my CJ7 (learned in a 2000 Wrangler so it's a tad different) well I pulled up to close behind my mom and didn't let out the clutch in time to reverse and tapped her rear bumper, no damage to either vehicle but my fog light bent back. I took it off and just rotated he rubber washer and it was better than before. Hey really are pretty durable.
'86 CJ7, I6 258 four speed manual. See ya on the trails!