I recently purchased a Haflinger that included a trailer that I don't need (because I already have a trailer).
Professionally, custom built by AJ Grant & Sons, Inverness specifically for a Haflinger .
Fully galvanised. Single axle. Braked.
Originally built for a SWB Haflinger and the previous owner has extended it to accommodate a LWB. Even has perfectly placed foot plates in right place for a Haflinger cab.
Appears to be in good condition, new tyres etc., light board works, I understand the previous owner had recently serviced it.
Equivalent Bryan James trailer is £2040 new.
Located near to Maidenhead, Berkshire (very close to A404, M4, M40).
£700 (ish). or maybe swap for Haflinger bits/chassis/canvas tilt/doors/etc.