Quit worrying about the number game. I've used a 36, 45, 47, and now 65 blower. I've gotten the best performance on suction out of the 47 and 65 blowers. I'll admit when I had the 36 blower, I didn't know what the hell I was doing with a truckmount, so I think it could've put on a better performance, because I see nothing but awesome reviews on the 36 blower. The important part on any truckmount is to have the blower set between 13-15" of lift. If you see that you need more suction on the long hose runs, upgrade to a tm with a blower 2 sizes bigger than your current one. You'll see a better benefit to your investment.