For single-axle trailers it is the right rear arm, for double-axle trailers it is the left front arm and the right rear arm at the same time, for trailers with a total weight of...
Axles for GROMEX trailers, AL-KO Compact B 1200-6 (1350 kg) a=1400 mm, 112x5, is used for GROMEX trailers 2700 kg (2x1350 kg) and GROMEX 3500 kg trailers (3x1350 kg).