Fiat Ducato suspension

Are you sure the 'crashy' feeling is caused by the suspension? We have the standard L1 (5m) Ducato and found the ride very harsh but it has camper tyres which are supposed to be inflated to a higher pressure than standard tyres. Reducing the pressure has helped considerably but the ride is still harder than our previous L2 which was fitted with air suspension. I’m not suggesting you run your tyres at an unsafe low pressure but tyres are a factor to consider as is the fact that Auto Sleeper see a need to fit air assisted suspension as standard.

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The suspension systems on Sevel built base vehicles seems to have got harsher with each model change and as you have opted for the upgrade in the suspension it will be even harsher when not fully loaded

Remember most white can man base vehicles are expected to be well loaded most of their working lives

MHs tend to be almost fully loaded at all times due to the weight of the conversion.

Really?so how come they have it seems large amounts of spare weight capacity 🤔 and the OP has PVC? with upgraded suspension (harder unless fully loaded

Just checked we have 800kg capacity on our Symbol on a 3300 kg base vehicle

Large amounts? Perhaps 500kg which is why I said "almost fully loaded".

Yes, I know the OP has a PVC which will always be either almost fully loaded or fully loaded. I don’t see your point, tbh, as you seem to be reiterating words and that isn’t helping the OP.

I'm afraid the figures relating to your older Boxer built on a different chassis have no bearing on the matter of the OP's suspension on his new Ducato.

We have a 2016 Ducato MH with standard suspension, (2800kg unladen, 3500kg max)

The suspension is quite stiff making it a wee bit harsh on rough roads, but it also doesn't sway on corners, making it pretty good to drive. I have driven Mercedes vans where the soft suspension makes cornering interesting!

I looked at recommended tyre pressures from tyre manufacturers for the weight of van and run them at 65psi, which is quite a bit lower then the figures on the van and improves the harshness a bit.

That's much the same as us, LL. Ours is 2021 and can be very harsh with the tyres inflated further. The difference between this van and the last which had different tyres and air suspension is very noticeable.

We are looking toward a PVC (Adria Twin Sport / Malibu currently catch our eye) as we approach retirement and watch a fair few YouTube posters.  There appears a trend to change wheels and tyres from factory fitted to  alloy with all terrain tyres  that run at much lower pressures (IIRC 45psi) than the OEM set up at 65psi+. Said posters mention a better ride.

Not so different chassis  just upgraded for the later and even more so for the very latest