I work construction so I use lots of different pieces of wood for our trailer.
I usually have 8-12 pieces of 2x8x12" for under the jacks and tongue and then 3-2x8 with a 60° taper cut to drive on for leveling purposes. One is 8' to the long point as I have a 8' truck bed to store them in, the next is about 6" shorter and the next 6" shorter than the previous. This gives me 4.5" of leveling ability without getting creative. I also use them at home as the part of the driveway the trailer is stored on is basically 4.5" out of level also.
1992 Dodge D250, 18cm housing, getrag 5sp, 4" straight pipe
2015 Pacific Coachworks Sand sport 18SLE