For some time ago I saw a boot lid holder with a "grabber" and a hook in the ends.. Would bee awesome to have, so you don't have to do like on the pic below Also been using paper towel roles to get the boot lid away. This tool would especially be nice to have doing estates.. It really bugs me that I can't find the site that sold this..
Try using a tri-pot in the trunk and have the boot rest on it? Hmm, show rod may work. I will search later tonight, unless someone else post something up.
What about something like this, Lisle 45900 Universal 18-1/2" to 46-3/4" Telescoping Hood Prop , then on the other both ends put a chuck of rubber for extra grip.
That could work with some modifications... The thing is that I saw the excact right stuff on the web, but forgot to store the link.. so annoying..