The "aw this drives nice" takes more than just robotically getting into alignment specification ranges defined for any given chassis
One problem with RVs on the E chassis is that it's a tweener ... not quite a truck and design roots of urban delivery.
There's 2 choices ... 1) learn and understand specifications enough to know exactly what you want, for how and where you drive so you can negotiate achieving those specifications or 2) find an alignment specialist that first knows and is willing to take the "time" to do it right based on your use.
Either way ... Secondary highway (2 way crowned pavement) optimizations differ slightly from freeway and then there's urban delivery. Get it tuned for how you use it most! RUV as a local soccer or tailgating rig, is right there with urban use design and typical in-out discount alignment shops will be just fine