How level should I be side to side at home?

I currently have our new TT parked out front in our parking area by the curb. I want to move it out back on our concrete pad where I stored my popup. My dilemma is if I ran up on 2x12s I'd need (7) seven high to make it level. I have quite a slope. I'm in the process of finding a permanent solution, but we leave for a week starting 7/25/16 and I want to get it off the road and I have home security out back where I can monitor the TT if it's there.

My question is if I went (3) three high (4 1/2") instead of (7) seven high (10 1/2"). Would it matter if it leaned? It will most likely stay there till 8/10. The day before our maiden voyage.

Thanks everyone

MOD: Could you please change my title to Should "I" be instead of be be :)