I am looking at a similar purchase.A tiny trailer is a specialty item - the manufacturers don't produce a lot of them, so you may be surprised to see a high price for them. I am wondering if the JRCO blower buggy attachment would work for me.
Your mowers must be 36" wide max if they fit thru your gate, right ? They make blower buggys for mowers that narrow. And the debris loaders are narrow enough to fit on the blower buggy. You wouldn't have to mount the debris loader at all, just quick attach it to your mower when you need it and push it out to your trailer.
Here is the link
for the blower buggy. A video link here
shows that it handles a blower at full speed, and the blower vibration must be similar to that of the debris loader.
JRCO's mower fit list is here
I would mount a debris loader to a 36" metro or similar.