So long as both caravans have AlKo chassis, yes, it is possible to transfer the unit from one to the other. For caravans with a BPW chassis, you need either the BPW iDC system or the LEAS stabiliser which is universal for both AlKo and BPW.
Unless things have changed Al-Ko did not allow dealers etc to retro fit these units; that right was given to only one or two specialist companies. Nor would they sell for a DIY job.
So getting an installation done is likely to be restricted.
There are models for different mass vans but in your case I assume the van weights are similar.
Technically it looks like a straightforward job that I would feel competent to attempt if I needed to change vans.
There is also the issue in some cases of it being an original fit item; disposing of a van with it removed might have issues and would ethically need to be declared.
Alko ATC system £500, why not just sell the system with the van, it would cost at least £100 to get it taken off one van and fitted to another. is it worth the bother??
The following AlKo ATC kits are available for retrofit:Single/Twin AxleMTPLMMIRO minimumAlKo Order No.Single750-1000kg500kg1 223 022Single1001-1300kg800kg1 223 022Single1301-1500kg1000kg1 223 023Single1501-1800kg1100kg1 223 287Single1801-2000kg1300kg1 225 186Twin1300-1600kg1000kg1 223 161Twin1601-2000kg1200kg1 223 162Twin2001-2500kg1600kg1 223 288