I have a 2017 Cyclone CY 3611 JS. Heat strip in garage is virtually worthless. Heartland needs to upgrade the roof top unit. If there is a heat getting to the garage from the furnace, it's useless too. We used a electric heater and it worked well, but for close to $100,000, you'd think Heartland would have done a better job of heating the space.
Another recommendation to Heartland. Place controllable dampers in the floor vents. Mine has none so the master bathroom blows like craze and steals air to the remainder. I place a mat over the vent in the master bathroom and bedroom, until i can purchase new vents with dampers.
I met a family at the lake a few weeks ago and he wired his garage with a 30 amp and a 15 amp so he could plug into the same pole as with the 50 and not rob power from the RV with auxiliary heaters, etc. in the garage.
Brad