Nice one George. You do need some substance to a trolley or else it will just bounce uncontrollably over every single stone.
i would consider a larger better fitting foam insert for the yot (or anything else) ideally squidgy sponge
but builders 50mm expanded polystyrene would be cheap and easy to use, perhaps with a soft foam seat for the boat itself?.
Ashley
Edited By ashley needham on 24/07/2020 09:52:24