Ideas re. keeping critters off our tow vehicle when camping?

A blue tarp and some bungee cords

In the Everglades National Park the vultures and crows love to sit on parked vehicles and peck away at the rubber windshield wipers and moldings, and the park service has large bins filled with tarps and bungees for visitors to borrow to cover their vehicles while they are out hiking, biking or paddling.

We have our own just for the purpose you are talking about

Jack L