I also asked our dealer's service manager about Bighorns and he said that in the last three years, not one has come back for warranty work. This is the largest RV dealer in the state.
Heartland makes a great rig and I believe it is possible for many rigs to never go back for warranty. My previous rig and current rig has never been back but I took care of many of the small things. That being said I would be very careful with anyone who works for an RV dealership that says none have come back for warranty in the last 3 years. That does not compute in my brain after reading posts on this and another forum for a number of years. :)