Having had plenty of experience towing with a 434 using the issued one-piece folding A-frame, and towing with both Chieftain ARRV and CRARRV using the much heavier hollebone set which is provided in parts as described above by Dave, looking at the photo of adaptors posted by andym I can confirm that the middle pair of adaptors are part of the 434 CES with the one-piece folding A-frame for towing 430 series vehicles. I'm unsure about the other two pairs of adaptors but I'd say from the size of the holes they would also fit the 434 towing frame.
I have used a 434 to tow a CVRT Spartan a couple of times but it was nearly 30 years back and I cant remember what the adaptors were like.
I know we had a similar system on the Warrior 513 but I never had the chance to use it.
Tim James
