Just to add on the above:
1, I second getting an Scangauge II (Search here on the importance of monitoring LF1 and LF2 on the 8.1L as it will not set check engine lights when it should for lean fuel conditions, this is possibly the number one killer of these engines).
2, Once loaded at travel weight get the coach weighed 4 corner weight is best, axle weight is ok, then adjust the tire pressure according to tire manufacturers load charts, just 5 psi off can make a big handling difference
3, Consider upgrading to Ultra RV Magnum Extreme spark plug wires https://www.ultrarvproducts.com/SPWE...ark-Plug-Wires
they are pricey, but spark plug wires going bad is one of the key causes of engine lean condition on these coaches, along with O2 sensors and MAF Sensors going bad.