You nailed it! I bought a dovetail 18' footer with the fold up ramps. I wish I had purchased the 20' flat deck with slide in ramps. The fold up ramps just get in the way.
I'm in the process of looking for a trailer. Currently rent and getting costly. I'm done looking for used, too. The dove tail vs flat and 18' vs 20' are my issues. Attachment shows a 16', fold-up ramps, and dove tail. It drags if I don't angle when leaving driveway or pulling off road into camp lawn. 20' flat deck and slide in ramps seem the way to go so long as the weight isn't too high. My tractor and brush hog are 4500# so I'm looking at 10k. I just have to decide how often I'll have the brush hog and tractor on together.
