Had a big problem earlier in the week with reversing our BV125 x 7' high box trailer. Drove the van and trailer onto some grass and left it there for a month or so. Since then it has rained heavily and despite all efforts could not get sufficient traction to over-ride the braking system when reversing. Unable to move forward or uncouple the trailer and drag it back I contacted Ifor Williams.
They told me I could buy a Manual Reverse Kit P00915 which would allow me to over-ride the brakes. Small problem -they wanted £31.00 for the part and £17 for postage to France!
Well, determined not to be forced to part with that much I had a look at the coupling. There is a slot under the handle which the part fits into. Good news is after a couple of hours attacking a piece of 4mm plate with saw, drill and files, plus a few washers and a bolt, I managed to make a part to fit securely into the slot and do the job. What I must remember to do is remove it before driving off otherwise the brakes on the trailer won't work!