Probably not. Pre/Post is really for advanced users – you would know if you needed it.
The Road King is for advanced users too.
The simplest setup would be guitar – H9 – Road King. However, if you are using the H9’s in one or both of the Road King’s FX Loops the best setup might not be simple anymore. How do you normally use your H9’s? I have no doubt this can be figured out quickly but its a situation that will require some figuring out.