I believe that the upper limit for a trailer without brakes will be 750Kg, and that is with the factory tow bar. If your trailer has brakes, then 1500Kg.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC