The problem I found with my 12 feet stock Valley it was SO light that it actually did feel more bumpy to drive than my 12 feet slant Adam (also it didn't want to back up as easy). Both are BP. BTW, I believe 14 ft Valley may come with the "dressing room".
I've never had problem with stopping even going down a very steep hill (knock on wood!), but remember to keep a good distance always and check your breaks and transmission periodically.