To go below 5000 feet you need a good cooling system to disapate the heat. Bring many bandaids for the explosive gas. Between 1400 and 1500 feet look for a religous artifact that will give you 200,000 bucks to get your upgrades going.

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes