We have the 2014 Georgetown XL378, we haven't had any of the problems that you have.
You might want to get a front end alignment done.
Both of my furnaces work just fine, together or separate and it doesn't effect the stove at all.
I hope someone else can help you, good luck get it all worked out.
Pennie and Chuck, Mandi and Polly (the little dogs)
2014 Georgetown XL378, 2013 Honda CR-V AWD Toad
Days Camped 2014 - 83, 2015 - 56, 2016 - 49 and counting
The Home of the FREE because of the BRAVE