I have two toweds, both have RM brackets and no cross bars. I don't have any problems that I know of and I use the Stowmaster tow bars.
"I travel not to go anywhere, but to go. I travel for travel's sake. The great affair is to go". R. L. Stevenson
David Bishop
2002 Winnebago Adventurer 32V
2009 GMC Canyon
Roadmaster 5000
BrakeBuddy Classic II