Pelrhaps by now you have already located a trailer? But thought I would advise you of the as listed 18" Trilliums trailers. (they are very rare - not many made at the end of Trillium
making trailers - 1980/81. I am far away from you but this will suggest you could 'look for' this type of unit if so desired. (I have had 13 and 15' Trilliums over the past 15 years and did NOT know that they made an 18" model. They previous owner pulled it with a 1991 Toyota with approx. 250,000 MILES on it - worked well.
I have a 17.4inch TRILLIUM
- Has 'dinette' in the back - puts down to full size bed.
The FRONT also has a dinette in it. Length is less - as storage bin on one end - but still approx. 6' 2" in length - also the width is approx. 2 or 3 inches 'narrower'.
Trailer has everything except AIR C. Outside full awning