Aloha!
These rigs are really "Super C" motorhomes. They are great, powerful, and expensive...but sadly they never made a Toyhauler. I just don't understand why...I would think it would be a great set-up.
What Class C Toyhauler are you looking at? They are too rare for me to have considered one.
We have St. Bernards and work with a Saint Rescue, so we know exactly what you are dealing with...so if I may, I will suggest you think about a Class A Toyhauler - in the Newmar 3920 or Damon Outlaw 3611, 3808, and the new 37LS and coming later in 2013 the 37MD.
These have THE BEST set-up for BIG DOGS with the open floorplan and separate garage for the pups and all their stuff. After you unload the garage, the garage surfaces are really puppy-proof for the hours between walks, shows, playtime and being with their people in the front.
See:
Motorhomes By Newmar Corp | The All-New 2013 Canyon Star
www.outlawrv.com
And this thread:
http://www.irv2.com/forums/f258/clas...rs-130973.html
Sunny Saints, Southern California St.Bernard Rescue - Welcome
Best of luck and safe travels