I also have a 2017 but elected not to have Phoenix add the solar at the time of the build. I was not impressed with the Samlex system and although they had built previous solar systems customized to the customer they refused to do it at the time of my build.
I went with AMSolar who specializes in RV solar. The clear downside is that they are located in Oregon but I was going to travel there anyway. They have state of the art systems and use a no drill hole method. I got a 4 panel system and the control panel is placed close to the control for the furnace/air con, which is convenient. I also like that the controller has a secondary system that keeps the truck battery charged as well. They have a strong customer service reputation.
As John said, check to see what Phoenix is doing now as it may all be completely different.
Some other things to consider with the solar controller and system: Are the charging voltages configurable? Most are designed for standard lead-acid batteries but I wanted Lifeline AGMs for the house batteries. AGMs have a different charging profile and Lifelines have a specific recommended profile. If you think you may want AGMs or even Lithiums in the future the configurability of the controller is important.
Equalizing: manually triggered, automatic, programmable? Equalizing de-sulfates the batteries.
Adding panels: does the system easily allow adding panels later?
Panel tilt: If you stay in an area for a while or camp late in the year you may want the ability to tilt the panels to optimize performance
Alarms: Some controllers have added functionality to set alarms when battery voltage drops to a level. Lead acid batteries should not be pushed below 50% charge for battery health.