My coach has a 10K hitch. The trailer I ordered has two 6K torsion axels in a spread design so it has a 12K capacity but I do not intend to load over the 10K limit of the coach. When you mention stress crack in the rear cap, are you referencing the fiberglass cap up top?

I think the only time I would want to mess with changing the engine cradle would be if somewhere in the future, I do an engine swap to an engine capable of running 100% biodiesel. I am in Oregon now and all the diesel is blended. I have to hunt to find diesel with only 5% bio. Most of the truck fueling stops here are running 15% or 20% bio and from what I read from Detroit Diesel, I should exceed 5% with this 60 series. I found the same thing in CA with a lot of 20% bio.