Leveling TC

I may be nieve about what I don't know, but someone told me a long time ago that parked for a week or less, it didnt much matter if both duallies were supported. Yea it would be ideal, but parked we aren't exactly pounding over pot holes and rocks, One set/tire gets the job done,
Lego style blocks for me. 2 sets plus a few 2x6 short lengths which rarely get used.