Surely the idea with insurance is you provide details of the risk you want covered ( value driver alarm tracker) and they offer a bet. If they decide the risk is higher the premium rises. If it's too high a risk they decline to offer a bet. If they were taking on a bet to cover your MH conditional on having a tracker and were going to fit it themselves they'd just add the cost of the tracker plus an admin charge and a bit of profit to the premium.I still say if insurers want a tracker it's for their benefit, not the van owners.
If they can track and trace it they won't have to pay out as a total loss saving them thousands.
Therefore, if the insurers want a tracker they should be responsible for having one installed and maintained.
Of course, that will never happen.