Here goes my first question of a newbie! We have a 21 FT Chinook and plan on towing an Xterra. I have looked at the specs for the Blue Ox tow bar and the Roadmaster towbar but can't really figure out any difference. I have a friend with a similar set up to mine and he complaines that the Blue Ox binds up and is difficult to disconnect in uneven terraine. Does anyone have any experience with either of these tow bars. I am looking at only the ones that mount to the car with the ball on the RV because the back door to the Chinook would be impaired with the ball on the car. I look forward to hearing any advice anyone wants to give. Thanks JODO