TBH, I'd forget the Sankey and get a nice 1 axle trailer.
Legally, they can go uo to 1750 - 1800 kgs and all the hard work has been done.
Saris has a 310 x 150 1-axle trailer that is 1.750 kgs. mam and that should be more than enough.
A good 2-axle trailer frame is just as suitable.
But the frame is less than half of tha well know Sankey, much lower and bits are sold everywhere.
Any, I'm looking forward to the build !!