I am thinking about buying a 1998 4700 dt466e with an auto trans. THis will be to haul my four wheelers and 4wheel drive on the bed and my 6k camper behind. It has 195hp right now and was wondering if I could turn it up to the 300 range maybe a little less just to have more power. the truck won't see 10k miles a year. It will have about 8k or so on the bed if that matters. What will be a safe hp level? There are a lot of hills where i live, like 3k climbs here in NM and Colorado. Any help is appreciated.