You can get plastic blocks which are twice as wide (think two blocks side by side) that are perfect for your duals when out on the road. You are correct, you need something under both tires when leveling.
You may want to get yourself a LevelMatePro system. Once installed and linked with your smartphone, it can can tell you what height blocks you need to bring the coach into level. Much easier than trial and error even with a level.
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Roger & Mary
2017 Winnebago Navion 24V
2014 Tiffin Phaeton 36GH (Sold)
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