Hi Sprocket
Thanks for your reply and links but I'm still unclear as to which colour I need. (Am I being a bit dim?).
The Alko site gives the required colour "Suitable for the weight ranges" red = 1301 - 1800 kg, blue 901 - 1300 kg but what weight ranges are they referring to ? Is it the MTPLM of the caravan or the possible weight loading of the axle fitted to a particular caravan ?
If it is the possible axle loading where do I get this information from ? Is there a plate somewhere on the axle?
My concern is that I never get anywhere near the 1350 kg MTPLM so would a red shocker rated at 1301 to 1800 kg give too much resistance ? The blue, on the other hand, is rated at 901 to 1300 kg, the higher figure being nearer to my actual loading. Consequently would the blue version be too 'weak' ?