Wow. You have $2400 or $2500 to spend on a 5 cubic foot trailer? Granted, it looks nice (behind a bike), but considering the options available, it seems a rather extravagant expense for so little a trailer.
Granted, the option I took isn't for everyone, but, for about $400, I put together the following:
1. Harbor Freight 42"x48" utility trailer w/spare tire;
2. Sear X-cargo 18 cubic foot roof-top carrier on trailer.
In addition (future enhancements):
Remove the car-top carrier, and replace with (as needed)
Grill and open cargo area for tailgating;
18" box frame with a car top camper (google "car top camper" to get a number of options) to make it into a week-ender camper.
It also allows me to put virtually any other frame-work (granted, it isn't huge, so some things are out of the question) on it, so that I can transport things that won't fit in/on a smart.
This same trailer is featured in a couple of web sites, made for motorcycles.
Just a thought.