[JRTJH]

Our first winter in northern Michigan, I covered our trailer with a commercial RV cover. As the snow/ice formed on the cover, it essentially "locked the RV under it". In the spring, there was no way to remove the "frozen to the TPO/roof structures" without either breaking something or ripping the roof off the trailer along with the cover....

Your "good intentions" of protecting it for 48 hours" likely would freeze that ice on top of the tarp, the condensation under the tarp would freeze it to the TPO and if you got "lucky" it would all defrost before you tried to remove the tarp. Otherwise, the water that turns to ice is still "condensing under the tarp" and doing the same type damage you're trying to avoid...

Take a drive some rainy day, count the number of RV's you find around your neighborhood and at every RV dealership in your area that have any protection at all. If there was a "potential for problems based on history and experience of owners and dealers" then every one of them would be "protected during freezing rain"... They aren't, because it's not the problem you imagine it to be.