Thanks for the reply's! I had thought about stall mats but dang, those things are heavy! But I guess in actuality doing away with the 1" of plywood and the 3/8" rubber mat there probably would not be that big of weight increase, if any. Most stall mats I see come in 6'x4' size so in order to double up I will have to buy 3 of them and cut one up to get the extra 2' of length needed. While looking at stall mats I came across something called a "ring mat" I'll have to check them out as well. They maybe even a lighter version of a stall mat.
https://www.southernstates.com/catalog/p-13300-red-barn-ring-mat-395-in-x-59-in-x-78-in.aspx