Replaced for the 2002 season by the current Vicon RV 1601 and 1901 designs, RV 156 and 186 variable-chamber balers are proven machines. Only when it comes to baling silage does care need to be taken, because some models are only really suited to a well-wilted, ‘sunny’ crop. This proviso aside, a used Vicon variable-chamber baler should make a sound second-hand buy – given, of course, selection of the ‘right’ machine