Thank you for your help, my horse is only about 350kg so I have been saying 400 to be extra sure, therefore it sounds like I would be ok if I got the plate dropped to say 1,300 like you say?
Sorry not sure as I haven't actually got the trailer but this is what the Spec shows?
Trailer weight and capacity (Kg)
Gross weight Unladen weight Capacity
1700 675 1025
The Trailer is a Bateson Derby, if that's any help?