Does FW need to be level during storage
When we purchased our FW we had a long walk through with the dealer who was the owner and avid RVer. He mentioned that the trailer should remain level to let the drains in the Windows work proper...
Forum Discussion
We store our rig at home close to level so we can readily turn on fridge a couple of days before departure if it isn't already on which is usually the case during camping season. We always have it tipped slightly to help with rain runoff, other than that there really isn't a reason to have it level if it is just stored for long periods of time. As with everything in life, do what works best for your situation, level or not is ultimately your call.
