Mtnflyer, congratulations on getting your new 3185. Do a search on this forum for PDI, you should get some information.
The main things are to have the dealer demonstrate all appliances. Have the refer cooling, heater heating, AC cooling, TV playing etc. Have the water hooked up and check for leaks under the cabinets and look in the basement. Have them put some water in the fresh water tank and try the water pump. Again look for leaks in the basement.
Be sure to check the lug nut torque. Tires inflated to the max listed on the sidewall. This is important.
Check all the lighting.
Check the allignment of the slides when open and closed.
In short, check everything you see. The dealer might not like taking that much time, but you are the buyer and it is important to you.
Good luck and enjoy your new rig.
Peace
Dave