I've been going through something similar with my used 2011 SMB Sprinter, and found that contacting the manufacturer is the best bet -- and they can usually provide a manual in pdf format.
More info is always a big help and saves everyone from playing The Spanish Inquisition.
Why do you only have one panel, and why replace it rather than add another? -- most folks install them in pairs. And why only a 30w jump to 160w? Remember that you rarely ever get the full rated power of a panel for a number of reasons, and may need more power in the future.
2011 Freightliner 2500 Sportsmobile RB110S, all electric, 160k