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for power in the high rockies of Colorado there are a couple of things you can do no matter what engine you have. Getting more cold air in the intake is a huge bonus up there, the oxygen content in the air is so much lower that getting good combustion is hard. Ever notice they sell 86 octane in Colorado? It is because less oxygen in the air makes anything over 86 worthless, like throwing money away at 5280-11,000' of elevation the air is just thin and you do not need the extra octane My dad always runs turbo cars like his old 96 Supra turbo, he ran 86 octane in that sucker!!, no detonation, no knocking, no problems, I was born and raised in the mountains of CO just FYI)
What your engine does need is more air down its throat. A good cold air intake will do wonders, also a well matched exhaust to take advantage of the extra intake air...even the anemic 3.0 can benefit here.
the next step would be some gears, to climb those passes you could consider re gearing the truck, what gears does your ranger have now? 3.55? 3.73?
I only use 87 oct or higher, I found out with my Dakota that 85 oct in the mini trucks don't last as long as 87 or 91. I believe my truck has 3.73 gears. I couldn't really understand the tag that's on the diff, but the numbers 373 was on one line.