Congratulations! Forester seems to be a decent model in the FR lineup. Still, RV's are assembled quickly with price point materials, so...
A VERY VERY VERY thorough Walk Through and Pre Delivery Inspection. Every drawer and look inside at the framing when it's open. Every cabinet door. Every appliance in every one of their functions. The roof. Look underneath. Fluids and Tires. Tires, check Inflation and check Valves. Should be accessible to you and should not be rubber. Outside compartments, check them. Slides and levelers should run smoothly, extend fully and retract completely. No funny business in any of the systems. Water system, valves, etc.
Take time. This is NOT a 15-minute task. My list is off the cuff. There are searchable PDI's on the web.