I fitted a set in my 105 and bought the correct kit to suit my 50mm suspension lift. I had very different results with increased ride height even at low pressures with the ability to go up to 60psi with the Kevlar sleeves. Make sure you buy the kit to suit your current suspension as they go from standard up to 4” lift.
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The ones I bought for my 80 series are able to go up to 60psi. I'm hoping that is going to level out with my caravan because it's dragging at the moment. my neighbour has a similar setup and he uses 50psi to make it level and take the 300kg ball weight. Tows great now though
Airbags are great for levelling, though they're not going to fix bad weight distribution in the caravan. Get the weight as low and as possible and as close to the caravan wheels as you can. It'll make the caravan a real pleasure to tow.