I know it sounds harsh... but I wish you luck navigating in a motorhome using that. I'd put my trust in "tried and true" options like Garmin (satellite) and/or Google Maps (internet based).
I don't really relish supporting Google, but when they've got you by the short hairs... sometimes you just grimace and take it. By having BOTH of those options with constantly updated maps, you have the most reliable navigation available to date - a MUST in a motorhome. Everything else either piggybacks off of those (Waze) or is a "use at your own risk" option.
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