I do not have the resources to look up the exact wheels that you have on your 2014 Heartland Silverado Big Horn 34SE, however, I did some research and it looks like you may have 8 lug wheels on 6-1/2" lug pattern.
According to my research, your wheels should have a hole in the center of the wheel that measures 4.9" in diameter which would allow fitment of Americana Trailer Wheel Center Cap - Stainless Steel - 4.88" to 4.90" Pilot # AM90156C.
To verify if # AM90156C will fit your wheels,... view full answer...
You are totally fine as-is. If your current brake controller has an electric over hydraulic mode and is working well with the Hydrastar it will also work great with the Kodiak you are planning to go to. view full answer...