Vehicles command returns vehicles.
Chairs and lights and the pallet, are vehicles.

ok, can we then get a command that returns only driveable/manable vehicles?

You already have it. You posted it above
vehicles select { (_x iskindof "AllVehicles") };

If you want to filter further for driveable/manable, you may want to also check for enableSimulation, and whether there are any crew seats available at all (Don't know how UGV/UAV behave in that regard)

In T173671#2473864, @dedmen wrote:

You already have it. You posted it above
vehicles select { (_x iskindof "AllVehicles") };

If you want to filter further for driveable/manable, you may want to also check for enableSimulation, and whether there are any crew seats available at all (Don't know how UGV/UAV behave in that regard)

yes I was thinking of engine solution for speed