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 Topic: sited twin axle tourer with flat tyres
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29/3/2024 at 5:55pm
Location: London
Outfit: Lunar Cosmos 524
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Quote: Originally posted by superdayold on 29/3/2024
.... Was watching videos on how to safely Jack a caravan up and 2 points were- to put on the handbrake on and attach to the car (can’t do either-see op) .....
The reason that owners are instructed to only jack up caravans when hitched to a tow vehicle, and with hand brake on, is because with a castoring unbraked nose wheel the outfit can easily slew around one main wheel when the other is lifted off the ground (doesn't much matter if single or twin axle, as lifting one side of one axle will reduce the load on the adjacent axle wheel sufficient for it to slip!), and outfit could easily move and fall off the jack! Entirely different set of dynamics to jacking a car.
A trolley jack has a little more scope to cope with a little movement than a say a simple bottle or screw jack would, but a large slew would still be a problem! I watched my service engineer jack my unhitched caravan with a trolley jack under the axle in the recommended position, it was on a near perfectly flat and level concrete surface, but still an alarming amount of movement of the jack! If you're on anything other than a perfect surface, it's a far greater risk!
Couple of years back, I had to jack my van to remove a wheel when it was parked on the slightly sloping loose gravel surface of its storage bay, no chance of using a trolley jack on gravel, no chance of hitching to the car either, so I constructed a robust chain and turnbuckle lashing, affixed to jockey wheel stem and 4 ground anchors to secure the nose with no scope of movement in any direction. I chocked the opposite main wheel as an extra precaution to hand brake, and then lifted the offending wheel with a bottle jack on a substantial piece of wood to spread the load, and the top securely located in my DIY jacking point attached to the correct location on the chassis. Worked a treat, no slew movement at all. BUT, should say, I'm a professional design engineer, all aspects were done with knowledge of the loads and movements involved and where necessary load/strength calculations done! My van is also quite light, a twin axle job is likely MUCH heavier and all aspects would need scaling up accordingly!
The suggestion of a professional caravan engineer is not a bad one, the engineer I used to use, used an airbag lift under the axle rather than a conventional jack, it would cope with both uneven ground and a little slewing movement much better than any single point of contact jack, and requires minimal ground clearance to put in place under the axle. Of course, you need a compressed air supply as well, so cheaper to pay for the engineer than buy the gear yourself for a one-off use. Seem to recall that you need a low profile trolley jack anyway, to get under an axle if tyres are flat, as normal one is too high to fit! Unless proper jacking points fitted (after market option, not normally fitted as standard!), you are not supposed to jack under the chassis rails (at least for Alko chassis!), as high risk of distorting them.
Good luck, awkward problem!
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via mobile 29/3/2024 at 8:19am
