The first aspect to determine is can a "balloon" wheel, conventional pneumatic or foam filled, be stowed on the "A" frame? Our present van can't but an earlier one could and I tried a pneumatic, a short lived experiment.
The type I like best is
Al-Ko soft heavy duty wheel.
You don't need 30 metres of ply boarding to track on.
Get B & Q etc to slice, just two cuts, a UK standard 8 foot by 4 foot sheet of 19mm into three bits, each 8 foot by 1 foot 4". Then just prior to tracking off the last one, move the other two forward. Put lanyards on them to aid recovering them from under the "A" frame. Six moves, and you have covered the 30 metres.
With the wider Al-Ko HD soft wheel I find the noise it makes directly tracking over gravel, is the worst bit, it still rolls over quite well.
Also "squat" the front down as low as possible, so the jockey wheel just misses the handbrake's undergear. This will minimise it twanging about by flexing the "A" frame's chassis rail it is fixed onto, thus behave with more grace.