You have already read replies that give you the weight ratings. You have heard from people that say it can be done even though the weight rating is exceeded. Will it damage the motorhome? Probably not.
But no one has discussed the legal implications. In our litigation happy society pray that you do not have an accident and injure someone with an overweight tow vehicle behind the RV. Takes an accident specialist attorney about 60 seconds to look up your rig and the tow vehicle to find your legal vulnerabilities