Whats the primary use for the Unwin tracking on the side of the hard top ? Not for extra seating / which is what its used mostly for !
The cargo tracking? Well my idea for very thin strong (Dibond) alloy panels that can slot into the lifted-roof sides to form temporary hard sides is going ahead, and I've started obtaining the materials.
I've been trying to figure out secure places to put them (there's two pieces for each side = 4, and a single hinged folding piece for the rear end) and I can get some of this on the roof, but thought it might also work on the side too. Also I've been down to Morocco a couple of times and would like a return trip in a year or two with the family, and the ability to strap a load of stuff on the side will be very useful, especially some extra water, sand mats etc. I figured if I was going to fit them it was easier to do it now whilst I have the interior stripped out so I did, and was able to get in behind and make sure they were well fixed and sealed.
I'm working on a simple awning (with zip-on sides) for both the back door area, and another for the passenger side (both will fold closed and lie flat against the sides of the 'new' roof) and I intend that the support leg for the side awning uses the cargo rails for support, so they should prove useful in the longer term in several ways. It's not hugely expensive stuff so it was worth fitting them just now. And I also put a few of the bolts for the cargo rail through a timber block in the inside, which is hidden behind the ply lining, which I'm using to fasten some of the interior fittings onto, giving them a good 'grip' of the wall.