CTFireman's right. The only place you should have any concern about this is with your dealer in warrantying repairs, and with the DOT in being over your axle weight. It's very rare for a front axle to fail unless it's been run with no oil, and I've yet to see a DOT man willing to crawl under a dripping truck in a storm.
The components will handle the load, get whichever engine works best for you.
I'm getting dizzy chasing all these threads!