I own a 2007 Eagle 42F with a full wall slide and full tile floor. This modelis definitely one of the coaches that have the overweight front-end issue.I just spoke to Kim at Spartan Chassis about their current program to upgradethe 14,600 lb front-end to a 16,600 lbs.He stated: The upgrade would consist of a complete removal of the current frontsuspension and replace it with the upgrade.The items would include:315 x 80R x 22.5 Michelin tires [replacing the standard low-profile 22.5]9 in. rims [replacing the 8.25 in.]Disk Brakes [replacing the drum breaks]as well as some other supporting components.Upgrade includes certification sticker for 16,600 lbs.There is currently an 8 week leadtime.$1000 deposit at time of scheduling upgradeTotal Cost: $18,995Cost includes Spartan retaining all components including tires.If you want to keep your tires the cost is $200 per tireRepairs must be completed at Spartan in Charlotte, MichiganEstimated time needed to complete repairs: 1.5 days
Reading the FMCA magazine today I noticed that the big class A 42' Winnebago they were reviewing came with 275/80R 22.5 LRH tires. I checked out the axle weight - 13.5K lbs as tested, GAWR of 14,320 LBs. That is way higher than I have with my 12R 22.5 tires, so I looked up the tire weight ratings for the firestones I run (just because I happen to have that chart handy) and their 275/80R 22.5 load range H tire is only rated to 13220 on a single axle, way under the weights of this coach.
... Still only 800 lbs headroom between "as tested" and ultimate load capacity - that is only 5% or thereabouts. ...