We are considering buying a 900 trail EPS, as a owner of a 11 800 standard I know there are inadequate pieces on the new rig. Help me configure a budget, what do I need to purchase for rocky mountain trail riding?

Based on the knowledge of my 11 800, do I need to upgrade the following?
Skid plates
dash block off kit
fuel tank skid plate
tires
air box/filter
shocks & springs