Can't say I agree with DJs method, but I bet rv dealers do.
Had a soft breathable cover on the old camper. It did its job, but in AK had a lot of ice buildup from freeze thaw and the ice eventually tore the fabric on the sides (don't try to remove it, why it tore).
Think I'd do the same, but top it with a plastic tarp at least over the roof to let the snow/ice slide off.
Some neighbors here (no snow, all rain) with a soft cover on their rv. Looks like same cover and the thing looks shiny every summer when they take it off. Looks like the way to go.