Caravan Chassis Riser

Mate they are normally a 50mm RHS section welded onto the bottom of the chassis, that has the suspension attached to giving the van more ground clearance.

Have a look here mate it discusses this issue.

Caravan Chassis Mods

Hi Mapesy I have had two jayco poptops raised at the factory which included a heavier aframe ,longer stabiliser legs , pull out steps, longer jockey wheel and a taller jack for $ 250 .This was when they were being built .All they do is fit the axle under the springs instead of on top of the axle . Critics tell you that under-slinging the axle will cause all sorts of dire events .I can say I have never had any problems what so ever with the handling of the van including passing road trains , side winds and cornering , I nearly always travel at the posted speed limits ,conditions permitting. Your jockey wheel and stabilisers will probably be able to be used ,the only modification you may need to look at is putting a step under the entry to the van and maybe a higher jack .The only reason jayco put all the extras on vans with this option is because of the Australian design rules .The convenience of not having to worry about drains and speed humps makes it a very worthy thing to do .I know that you are looking at adding risers to the chassis which may be simpler option but the axle under gives me an extra 5 inches height.Brian

Our 16.5 ft Jayco Poptop van has a height restriction - we need to get it into our shed. This limits any modifications under the van. It used to scrape the rear jacks as we left our driveway, so I reversed the jacks and now they clear the crossing (just). In addition, I mounted two rubber tyred castors under the rear bumper supports to take up any major bumps. Neither fix is by any means ideal, but at least we can still get our van away in the shed when we need to

Thanks so much folks for your input. I now have a good idea of what is required. Now for the pennies - might have to do some more travelling before I decide to do it.

Hey Norm, I had to give them back for the following year's plum pudding!! Buggar....