Differences in Reese Hitches
I have been exceptionally well pleased with the Reese Trunion Bar hitch (pre-dates two models for trunion bar hitches so far as I know) that I have used with my '64 Airstream Overlander for the past 8 years. I don't really think that you can go wrong with any of the products mentioned so long as the rating provides at least a 20% cushion beyond the weight of what is being towed. At one time, it was not suggested that the Dual Cam Sway control be utilized with the Heavy Duty Round Bar hitch, but in reading the current description I see that the new bar style now accommodates the dual cam system.
In my opinion, your most critical decision will be sizing of the bars - - especially if you plan to use the Dual Cam Sway Control - - I have learned that having bars that are rated just slightly in excess of the tongue weight results in better operation of the Dual Cam Sway Control. For my '64 Overlander (hitch weight 700 to 725 pounds), I am utilizing 750 pound bars (they aren't listed on the Reese site so they may not be available any longer - - but I do see 800 pound bars as a close relative). For my '78 Minuet 6.0 Metre (hitch weight of 410 to 425 pounds), I am utilizing 500 pound bars. I am just in the process of switching from Reese Friction Sway Control to Reese Dual Cam Sway Control on the Minuet so this will be my first setup with the dual cams on the lighter trailer.
Good luck with your decision!
Kevin D. Allen
WBCCI (Lifetime Member)/VAC/Free Wheelers #6359
1964 Overlander International/1999 GMC K2500 Suburban (7400 VORTEC/4.11 Differentials)
1978 Argosy Minuet 6.0 Metre/1975 Cadillac Eldorado Convertible (8.2 Liter V8/2.70 Final Drive)