Not really Danny,
With good quality tubes installed, (and correctly biased), You can thrash on it and it will take it, and last for a long time.
The Peaveys, are pretty well built and I have to say durable enough for road use. You can take these out and play football with them. It's pretty solid construction. I wouldn't do that with any of my ADA gear though.
As for the Fender, I have three other tube amps from the 70's, and they have been running 20+ years with the tubes that are in them, and still sounding good. The 400PS is in need for a re-tube, and probably wouldn't hurt to have it re-capped and checked out thoroughly, but after that, it can go another 50 years and still kick major booty.
Yeah I'm worried about my current MP-1; it's sounds so good and is working so well I almost want to baby it and I worry about ever taking it out of my studio and that's why I have so many people on here how road worthy there MP-1 ones are.
As for tube life I guess it does depend on the manufacturer. Here's a pic of my Marshall EL34 100/100 I sold back in June ( I know and I just got another ADA MP-1 LOL ) but I don't miss the "Hot Plate" as I called it and no matter what tubes and who serviced it I might have gotten a year and a half before the crackling then LOUD popping began! I was so annoyed with that amp and just kept retubing it until last year when the war broke out in Russia and tube prices started going crazy - so I got rid of it.
But good to know about the Peavey which I might consider if I don't snag a Mesa 2:50!