I just measured the driveway up and it's got a 7 degree slope. Approximately.
I also thought to myself "everything about the new Breakaway is better than the previous camper" .. I wonder if that means, despite being 2mtrs longer, it's ALSO better to back? Took me 15 minutes of fine fiddling but I did manage to get it into the garage JUST to the point where the wheels hit the flat. So my other half and I could simply push it in. AND it's heavier than the other camper but it rolls nicer too .. or maybe it's just our imagination and positive vibes ..
So I may buy a 12V wheel but it's now a lower priority .. after the hitch change (it tows low) and the new fridge.