Hello Johnny,

the weight depends on the material You are using.

Remembering my first load on a bicycle) trailer with about 130 lbs , I reduced the load weight to 60 lbs by building it with 20 mm Airex foam and 2mm plywood not coated with GRP.

So I am not shure what speed You are using to drive,but I think 20mm Airex 80 (kg/m3) is Β strong enough and You have a good isolation and no stalactive cave…hi