I recon, if ya practise backin ya trailer in for 3-4 hrs a week. In a coupla months ya will have it down pat...no need for a new Jockey wheel .
Seriously Craig, its not gonna make much difference what Jocket wheel ya have on the front of a 5.8m + boat.. there all hard to move around. If you muck around with the Jockey wheel height and take some weight off it, it may be easyer to moove.
I still recon backing in correctly is the go
Garry