We just did a 2500 mile trip from North Texas to Hebron, UT, (with stops in New Mexico, Colorado) in our coach pulling our toad (see below) in July. Some flat roads, some grade changes, higher elevations.
Knowing the issues built into the software for the temp gauge, and I have not replaced the air dam across the top of the radiator to the dash, I keep an eye on water temperature. It did move, but it never went above 2 marks to the left of the 210 degree center point, and generally no sooner di it move up there, once I was back to little or no grade, it came right back down the “1/4 tank mark (so to speak)”.
I have found a very low cost, fully settable, 2 channel temperature alarm that I have intended to install. One channel would be used to monitor water temp, the other to monitor transmission fluid temp. Things got too busy before we left on that trip for me to get it installed.
The beauty of that device is it will give instantaneous readings and can alarm you at preset temps as opposed to the apparent hysteresis that Workhorse built into the software - although what I was seeing in our trip, the temp gauge pretty much followed what I would expect water temp to do.
But I also think we are fortunate in the our coach builder didn’t try to choke the air flow past the engine as some coach builders do.
FWIW - we got the coach at ~37k miles. I immediately changed the oil, and did the Allison drain refill of the transmission fluid to TranSyn. And I flushed and refilled the radiator with DexCool.
Ed Gray will probably join in here to warn you on keeping an eye on your water temperature - and it was his advice that I researched a temperature alarm. But not having installed it yet, plus from what I have experienced, both recently and since we got the coach - I’m not as concerned now as I was.
Ď91 Ultrastar ChampionĎ02 Georgie Boy Landau 8.1l Workhorse
Ď03 Jeep Wrangler TJ 2018 Jeep Wrangler JK toad