I had ice on my slide roof unfortunately...here in MN it is deep in the throws of winter. My rv parks next to the garage and the slide just scoots under the edge of the garage roof. It was a nice day out, so I went out to do some modding. Maybe it was a little too nice as the house roof began to drip onto the slide and I didn't notice it. When I was done for the day, I tried to pull the slide in and the ice that had formed hit the slide seal...
No way to pull that ice off as it had frozen back down rather nicely.
Thinking I was now stuck for the remainder of the cold season, I cut some insulating foam and put it over the slide roof, threw heat to the inside of the slide thinking I could get it right off with the heat loss. Wrong again...
Fortunately, some warmer weather hit and with some water was able to clear the ice. Lesson learned here...don't mess with ice.
Slide toppers have to be a huge help in this area...I'm sure they have their drawbacks too, but getting ice off that slide roof is no picnic.