Depends on the weight you have on, how heavy the rain is, terrain, visibility. 4 days ago coming from Colorado to salt lake on the I70 around 12am horizontal snow straight into the windshield made me drop to 25mph for a good 20 miles because visibility was about 50 feet ahead.
My speed depends on many factors. What kind of roads? Straight with some curves or Pennsylvania curvy roads? How much weight I’m carrying? What’s the conditions of the tires? Am I driving in an area known to be stop and go? How far can I see? How much rain am I kicking up? Usually if it rains hard I’m driving between 50-60. If it’s a light or moderate rain I’m running 65 or against the governor. If I see some deep puddles I will let off the throttle and try to keep it straight as I can Incase the truck hydroplanes.
Drive to your skill/comfort level. Don’t be the person who ran outta talent!!! On the flip...if you are the only one going as slow as you are, it’s time to park & have a long convo with yourself. This job may not be for you.
Let em go. That's why I like to see my mirrors on the forward fenders so I can eye my steers. If they are getting wrapped then it's fixing to hydroplane. I usually back it down some at that point. This week has been a round of storms little tornadoes by the horde and big flooding in several areas.
Usually in the rain I like to chill at about 60 on most curvy interstate roads. I get past all the time by others who are totally in control of their trucks. I'm probably just slow. But I always have been, mentally and physically.
It depends on how much I can see in front of me. I came out Medina, OH yesterday and the sky opened up on me almost immediately after being loaded. It was start and stop very heavy rain. I slowed all the way down to 35 mph. The thing I never understand is why some 4 wheelers dont turn on their lights.
French mode is what I do, I do have plans to eliminate the thirsty incandescent for LED's upfront, they pull on the battery a bit.
They are 4wheelers. They are only concerned about their facebook on their phone and what they are going to wear to some stupid night club that night so they can take 800 duck lip selfies.