How about something like this:
It's shown on the back of an Escape :thumb:
http://www.1800petmeds.com/Dog+Ramps+for+Cars,+SUVs,+and+Trucks-prod468148.html
They fold for storage.

It's shown on the back of an Escape :thumb:
http://www.1800petmeds.com/Dog+Ramps+for+Cars,+SUVs,+and+Trucks-prod468148.html
They fold for storage.
