In general, you should think about what it would cost to replace your household goods and personal effects in the country of destination. A good source of information will be the local press in that country, especially with regard to high value items like motor vehicles. Cost of living data may also be obtainable from that country's embassy.
When completing your proposal form please be as detailed as possible. Remember to include specific individual items that have a high replacement cost; it's best to give as much information as possible.