Fitted the Ark coupling today, no modifications needed it is a simple bolt off bolt on replacement. The whole process took about half an hour (and a couple of beers). You will need
1 x Ark
ORXOF50 off road coupling
1 x Ark
MBP50P hand brake base plate
1 x Ark
CMB44B mounting bolt pack
I got mine from
Boat Trailer Spares in Brisbane, full cost for the three items was $269.40 delivered.
Hooked it up to the tug and it went on OK, very easy to connect to. Haven't towed it yet so don't know what it is like on the road. We will be going off road at the start of July so will report back how it goes
You may also need to replace your tow ball as the Ark needs one that looks like this
The original
The new one