The vast majority of suspension systems used on Australian caravans will be either loadsharing or close-coupled systems so , at the end of the day , it really doesn ’ t matter .
OVER-SLUNG OR UNDER- SLUNG AXLES ?
With basic solid-axle leaf-spring suspension , the most common configuration is an under-slung axle where the spring is mounted under the axle . They are designed this way to provide a low centre of gravity , which aids stability , but ground clearance can be compromised .
You may have seen some caravans that scrape their rear end on driveways and even mild speed humps . It can be a real problem if you want to go offroad .
For this reason , some manufacturers use an over-slung axle where the spring is mounted on top of the axle . This increases ground clearance dramatically but it potentially comes at the cost of some stability due to the higher centre of gravity .
Count those axles . You ’ re seeing right . There ’ s four of them . It is the only way to safely support a caravan that long and heavy .
Every suspension needs maintenance . If you ’ re servicing your bearings and brakes , take the opportunity to check your suspension too .
Some owners of caravans with under-slung suspension convert it to over-slung , thinking it is a fairly simple process , but you should never do this without professional advice . This conversion can mean ancillary items like brake cables and wiring may need to be lengthened and you shouldn ’ t be doing this unless you are absolutely certain you know what you ’ re doing .
CHOOSING THE RIGHT SUSPENSION
Deciding on the right suspension system for your van will depend on a number of factors . Where will you be towing your caravan ? Do you need to carry a lot of weight ? Will you be going offroad ? What is your budget ?
I ’ ve owned and towed a wide variety of caravans and trailers over the years and I believe airbag independent suspension is the best by a country mile . It provides the best ride and towing stability of any configuration , particularly over rough roads and in offroad conditions .
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