For at least peace of mind I would go with a Automatic Slider, even though they say it not needed. Like I've heard before in these forums... "Better to have it and not need it than to need it and NOT have it" I'm going to go against the grain here but I picked up the Hijacker 18K Autoslide Hitch to tow my 3400RL with. I have a shortbed F250 Powerstroke and installed the hitch with the underbed option. I've only towed with it four times but in making some of the angles I've had to I'm very pleased with it. The hitch doesn't require a Pin Box adapter as some of the other Autoslider's out there on the market which was a plus for me. Very heavy duty, tows well and well priced. Check them out.
http://www.hijacker.com/main.htm