I'm sure there's a "ride height" spec somewhere. If I can find it, I'll check it. My belief is that the front springs are slightly (but fortunately equally) sagged. Couple interesting points:
1. Even in this thread, it's well known that Jayco adds/added some Hellwig upgrades to its coaches. A lot of the bigger ones got Hellwig rear helper springs. Ours does not have them and there aren't any marks or extra brackets to indicate they were ever there. It also didn't have upgraded sway bars from Hellwig. Yet, there's a Hellwig Warranty Card in the packet I got from the original owners...
2. 2002 E450 had a front axle capacity of 4600, and 2008 and newer went to 5000. Yet, the people at Quigley where I bought the 2012 front axle, said the code tag of "VV" on my original springs, was the stiffest one Ford offers. In other words, the 5000 axle has no heavier springs than the 4600. Quigley re-uses the front springs when they convert an E-450 to 4x4 using F-350 parts, so I didn't get new springs with my "kit." Anyhow, our springs have had 4500 sitting on them since 2002. I'd sag too... Oh, I actually have!
3. Since riding front end low, lessens Caster, so I'd be glad to raise the front a couple inches, back to level. Somebody must understand that, because Super Springs are supposed to raise the front 2 inches.