"to level or not to level"

Leave the jacks up. It will take bit longer than what you described to cause the tires to flat spot. If you really want to get the tires off the ground jack stands are a better option but you always have to have a backup plan other than the installed jacks to get the coach off the stands if there is a problem.

Plywood is probably OK to get the tires out of the dirt but what might work would be to cover the wood with OTR trailer mud flaps. Usually made from recycled tires and not very expensive. Three will work. Cut one in half from the front wheels.

The off level area you described shouldn't be a problem for the coach. I would alternate which side is on the down slope. Your drive axle wheel bearings could be lubricated by the differential oil and if it sits long enough and slope is great enough one side could dry out and rust given the right conditions and time. A monthly drive and generator exercise would reduce the potential problems sitting could cause.

Good ideal!!! haven't thought of that, I could level and not have to use the jacks. I will give it a try. Thanks Effy. That's a prime example of "you don't know unless you ask"

How about plastic leveling blocks? I have used those in the past with success. Just make sure both rear wheels on the side you are bringing up are on them.

Thanks Effy, that was my first thought, but my parking space is unlevel side to side and almost level front to back so the weight is probably greater on one side?? Also what if I use plastic sheet over wood?

I wouldn't use jacks for an extended period. I don't know for sure but it seems like you invite problems letting the rams exposed for so long. Not sure I would park on wood either. Wood collects moisture and is bad for your tires over extended periods. Gravel or asphalt would be better I would think. These are just my opinions.