Interesting tread this..
IF you consider taking this trailer over to the Continent at any time, please note that for single axle trailers, even foreign plated, the max weight is between 1270 - 1750 kgs.
And esp. the FR love putting people on a weighbridge (Peages have them everywhere..) when they have a feeling about being over the max. axle weight.
I seriously suggest you look into 4 wheels for the project.