Bighorn is manufactured by Heartland RV company. Keystone is a competitor of Heartland and does not produce Bighorn RV's.
That being said, you'd probably do much better at getting answers to your questions about a Heartland product on a site where those products are discussed. On this Keystone forum, you'll find very few members who previously owned Heartland products, so answers to your questions will be severely limited.
As a probable observation, any previous owner of a Heartland RV who now owns a Keystone RV probably bought the different brand for a reason. Many reasons may be things like floorplan, price, etc however being unhappy with or having bad service from the Heartland product may produce negative answers to your questions.
Do a google search for Heartland forums and see if you get better results for your questions.
And, almost everyone here would recommend a Keystone RV for your ultimate purchase