Total towing weight came in over 1,300kg, though my rig will probably be a little heavier than most:
Breakback addition to trailer 40kg, Additional lead ballast 83kg & heavy battery 21kg.
Subsequently I have purchased a 1,500kg axle beam from Indespension, which is a direct fit on the RC3, with the only exception being hubs extending
a further 15mm each side.
Existing coupling, winch, rollers, wheels and tyres (steel belted 175R13C) etc all appear compatible with this capacity.
I did enquire about part exchanging the RC3 for a 1,500kg RC7 but probably due to age, this was uneconomic.