I use a drop receiver with my tow bar. In general, most tow bar manufacturers suggest that the bar be nearly level (when parked on level ground) between the base plate and the hitch for best performance. However, a 6" drop receiver may create a problem negotiating dips, causing the hitch to hit the road. In a worst case, this could severely damage your hitch and receiver.

I now use a 2" drop receiver instead of the 6" drop receiver I originally used -- and ruined -- after going through a deep 'dip' for drainage while entering a business in Texas. Fortunately, I didn't have my toad attached nor did the incident damage the main receiver. The 2" receiver puts the tow bar barely within the mfg. spec, but it's preferred over the alternative. My Toyota Camry tows quite well despite the angle of the tow bar.

The only time my toad did not recover its steering properly was on a very sharp turn at low speed in an RV park on loose gravel. There was insufficient friction between the gravel and the wheels to pull them back into track.