Hi ... I was wading thru the Au Govt. Dept of Infrastructure & Regional DEvelopment when I came across these super checklists.  I'm not sure in what context they were submitted/posted, but they are certainly Super Checklists.

Look at items 47 & 48

http://search.infrastructure.gov.au/search/search.cgi?collection=infrastructure&form=simple_infrastructure&query=Towing&start_rank=41

edit .. Playing with links.

-- Edited by Cupie on Tuesday 30th of May 2017 12:13:28 PM

 #48.......  Yep, curtains and apolstery will make or brake the "suitable for towing" Grayam  

Hope you are both well.