Hate to say this because they do look good, but a word of warning my brother had to use some when he worked for League Express and if you were travelling anything above 50 mph especially on the motorway they do have a habit of flying off and if you are on the motorway count it as lost, becasue you would be unlikely to be able to retrive it
its a shame really but I thought I would let you know of his experiences at least 4 were lost this way and he is not a speed merchant, ifact we call the pipe and slippers driver
and if you do decide to go ahead don't forget to remove them when you get to destination
you know what can happen