Motor mover and jockey wheel combination

Last year I got a motor mover (manual engagement type) fitted to my Bailey Ranger and it is a great help for a solo caravanner. The main observation is that off tarmac there is an issue, the jockey wheel drags badly, especially turning in mud or loose chippings. Makes a big mess, slows it right down and puts high load on jockey wheel assembly. Thinking about it there is around 50kg noseweight sitting on a small moulded plastic wheel so no great surprise.

So what is the solution? My ideas so far are :-

1) Move heavy objects to rear of caravan before siting but even awning isn't that heavy

2) Fill water drum & waste container and place to rear of caravan a mess about & they could slide but 2x 25L would give 50kg albeit at less distance behind axle than hitch is in front

3) Change jockey wheel for something larger and pneumatic pneumatic tyres are standard on building site wheelbarrows because they have less rolling resistance in mud

Any other sensible ideas, or practical experiences, would be welcome