I have a briford engineering three motorbike rack. It fits any briford trailer (including hire trailers which is why I bought it) and has three "slots". It fits across the front of the trailer and has three sets of uprights which form a slot that you wheel your bike front wheel into, then use tiedowns to hold the bike in place.

I measured it heightwise before buying but didnt think to check the distance across the slots and of course none of my bikes will fit it. It is made for dirt bike tyres, not road bike tyres........ I had a little go at bending the uprights to make them wider but the increased width needs to go all the way to the bottom, not just in the middle. All you will need to do is clamp it and bend it back again to fit your dirtbikes.

So if you want it it is yours free of charge.... all you have to do is come pick it up in christchurch or get someone else to.

First PM gets it.