They seem to have lots of lights here
http://www.trailertek.com/acatalog/Rear_Lights.html
They have spare lenses for the inevitable trailer rash, usually the stock answer is 'no call for those mate, have to buy a pair of new units'.
Also have some boxes
http://www.trailertek.com/acatalog/Storage_Boxes.html
Although they are for under-slung use (I guess), they do look well made.

Anybody bought here or used / seen the boxes?

Not used them like the look of their storage boxes to go on our Ifor, but they have one hell of a christmas break, don't reopen til the 12th!!! saved the link though thanks!

Used them a couple of years ago to get bits to rebuild the brakes on a horse trailer.
Found them to be very helpful, offered sensible advice on parts at the time, and were not pushy.
Wanted brake shoes for a 25yr old ish rice trailer, did not have them in stock, but made the call there and then to the trade and got them in couple of days from several other suppliers.

Based at Micheldever between Winchester and Basingstoke on the A33.

Used them quite recently for some replacement units for my Ifor. The service was good with very swift delivery. I didn't think that the prices were that bad either.