i had one similar to that it was just that bit wider than the rack
Just for the record... that's a DToplight Plus. I measure it to be about 115 mm wide. The Thorn rack is 135 mm wide. So the rack is a cm wider on each side.
Whether that'll save the rear light if/when the bike lands on its side... is probably pretty far down on the list of the things I'll worry about in that case!
Ha! Did I tell this story already... back probably August 2011 or so... I was trying one of my early attempts to find a road marked on a map but that didn't really quite exist (anymore?). This was the link between Jockey Hill Rd and Morey Hill Rd. There is a photo many pages up on this thread from that ride.
I was riding south on Jockey Hill Rd. looking for the obscure linking road. Jockey Hill Rd. itself seemed to come to an end. but parked in the cul de sac were several cars with bike racks and then maybe 8 or 10 good fellows with beers and mountain bikes. Well, hello there, can I get from here somehow over to Morey Hill Rd?
These good fellows try to be helpful. Oh, sure, just, uh, yeah, the third puddle, or is it the second, go left, or straight, or... sure no problem. So I just get back going and head up the embankment... kaboom, over I go, the first like three feet. These fellows are kind, nobody laughs, but I am sure I was blushing. I just get back up again and keep going. Another ten feet and some helpful soul shouts after me: You have GPS, right? Ha, still not quite yet! I did get over to Morey Hill Rd... eventually! Amazing that I didn't rip off my rear light connector on that adventure... plenty of absurd terrain there too! But hey at least the rear light itself didn't shatter. Yet!