Speedy chocks
We have a Gemini 23tb and speed does not seem to be a problem. It has a 3.2 L power stroke turbo diesel and our last 954 mile trip was at 15.8 measured mpg in mostly hilly terrain. I usually travel below the posted speed as I find it less tiring than weaving in and out of traffic. Even at that I am good for only about 8 hours. Anything beyond that and get irritable and fidgety. I had rather enjoy the drive than fight the traffic. Also, after leveling with blocks, I set the e brake and always chock one front and one opposite rear tire in opposing directions. Not sure that it matters but makes me feel better.
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