It is likely to be a requirement that all vehicles travelling up hills on private or forestry land will have to be fitted with a spark arrestor - this is a stainless steel gauze that is clamped over the end of the exhaust pipe and stops any sparks being spat on to combustible material and starting a fire.
Spark arrestors can be bought on TradeMe here.
In addition you will need a small shovel (plenty of folding ones on TradeMe) and a 1Kg fire extinguisher.