There's nothing about a 2005 unit that makes it bad in its own right, provided it's had care an maintenance. Also, Winnebago is a very good brand.
Where will you be traveling?
I think you can find a rental that gives you a little more confidence. I don't like the way they decline responsibility for appliances like the fridge. Fridge won't strand you on the side of the road but you want to be able to keep your food fresh.
Suggest you at least look at
CruiseAmerica
El Monte
Camping World RV Rental
What's drawing you to Transatlantic?
A gOOgle search "rv rental" returned some hits I didn't check where it seemed you could rent privately owned RVs through an agency of some sort. We had a moderator here who did that. His point was "Why leave an expensive item idle between vacations when I can get some of my expenses back?" Most of us here wouldn't do that, but it might be something to look at.
Still, it seems you've uncovered a major concern: If it breaks down, What will they Do and How Soon?
