I can't help with how to make bluetooth better but it is possible to achieve your goal, manage bmpro/jaycommand while far away from your camper if you can use BMPro Cloud... here are a couple ways:
1. While traveling... with your smartphone, enable HotSpot... in your camper, (do this before you start driving) log your bmpro wall tablet into your HotSpot and then you can run JayCommand on your phone and it will be like when you are using bluetooth.
2. While camping... In your camper, log your tablet into campsite's WIFI and then you can run JayCommand on your phone and it will be like you are using bluetooth next to your camper.
Both these methods leverage the free BMPro Cloud account. Here are the details within the owner's manual.