Zero, I've had a few Lintrans over the years, and originally I was going to make mine from GRP, but it's a big job making the moulds and laying up the GRP. But I also saw that their custom ones are made from PP! Probably 95%of the ones sold here are just welded mesh sides/doors etc, with a plywood floor and over centre catches on the doors for use with a padlock - all pretty nasty really.
There is one product that is very popular here because it has been crash tested by the swedish institute of something or other. So many folk think it's the best for the dog. But on reading the full test report, the test was really to make sure the box wasn't so rigid that with a rear impact it would break the rear seat and injure passengers. As an aside, they noted that the box didn't split apart. As it is, car rear seats are pretty strong and tested anyway to make sure that loads from the boot are resisted. But no-one reads the full report, and being swedish they see 'crash tested' and believe it can only be a good thing. Of course, the reality is that the box could be made very safe for the dog, but then cause other problems, or vice-versa, but you can't have it both ways.
I have seen a couple of other companies stating their boxes have been crash tested, one of which comes from switzerland. But they don't say who crash tested them and what the result was. So I'm also tempted to add 'crash tested' to my list of benefits. After all, a Mini Metro was crash tested!
I have incorporated a rear 'escape' door, as everyone else offers this.
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