Full extension of landing gear making me nervous

I built these blocks out of 7 ply solid core Douglas Fir plywood.

The larger ones weigh 12.3 lbs and are 10x10x16 with two 3/4" dividers inside

The smaller ones are 10x10x8 high and weigh 6.0 lbs each.

So per volume the plywood boxes are lighter than solid lumber. I will also add the plywood will not crack or warp.