MaxiMog
How come Jeff (JunkMan), our resident Unimog fanatic, didn't tell me about this one? A trailer with two 'swing-outs' - which look a lot stronger and more practical for the home builder than slide-outs:

The Unimog tow vehicle is interesting too - mostly as the most expensive vehicle that can follow a 20-year old Toyota pickup across Africa. I've never even heard of laser and video height clearance checking before!!
2-Axle Trailer
Never seen one before - currently on Ebay (#4614659844). Sure fixes the hitch weight estimating problem!
1961 Geographic
I found this while looking for the Grumman - this has to be the best-quality styling job ever seen on a trailer - I didn't say discrete, just very well done!

Andrew