RE: Newbie signing in...
Sounds like an interesting adventure! I suspect the vibration at that speed is tire unbalance. It could also be tire roughness due to flat spotting but I think a balance job should do it. I would set the tire pressure at 30 psi (your units may be different) minimum, but depending on loading you probably should go 32 to 38--the ride will suffer and depending on the roads, higher pressures can increase the possibility of punctures. As far as the cooling fan coming on, I can't answer that without knowing what temperature it is running at. If it is running at normal temps, the fan may never come on. Here in Arizona, my fan seldomly comes on (even at 100F) unless I let it idle for a long time or turn on the AC.
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