Dillb I think you must have been lucky with yours, I had one for 2 years on sites which got a little abuse not as much as yours from the sound of it, these are excellent on big sites where the van is 20 mins walk away, the only issue for me is their robustness and the fact you need a small bag as well for jobs climbing up to different levels via ladder! And lack of real security for when its out of sight ,one poor lad lost ÂŁ1500.00 worth of gear in 10 mins ,he'd locked it all up including chain to railings and went to the site office for some drawings and came back to a couple of chains hanging off the rail!
I had issues from the start with mine....
the clips that held the lid on broke very quickly, I managed to get replacements foc then those went
the wheels kept on falling off/splitting
, I made some mods and fitted my own wheels and axle which improved it no end!
Just got bungees holding lid now!
Its a great idea just a shame that they are like most things these days made with a max working life which is less than we would like!
A friend of mine said there's a military version which people use to lug gear around in , "hardigg boxes" but unless they're on ebay second hand they are expensive!