Jockey wheel size / solid / pump up / Motor mover

Gadgets

I am going to upgrade my jockey wheel, its to small and sometimes sinks in grass when using motor mover.

Are pnumatic jocky wheels better than solid rubber wheels with a mover?  I know I will have to get the fork made bigger & wider locally to take a bigger wheel.

I uprated the jockey to one of the more commericial types with ribbs to prevent any more jockey shaft slippage. It happened several times to me despite the clamp being fully tightend (it was strecthed oval)the round shaft slipped and down went the caravan
to the ground in a flash. The ribbed version now locks solid to the clamp and can not slip.