What type of FR toyhauler are you looking at? What do you plan to haul in the toyhauler?
We have a Wolf Pack TH (5th wheel), with the stepdown garage (lower floor), but really haven't dragged the rear end...that much. Our unit is self-contained (generator, etc,) because we do a lot of dry camping and hunting throughout the year. We have had great times and luck with our 5er.
Ed & Laureen
2005 F-250 4X4 SD 6.0 Powerstroke
2009 Cherokee Wolf Pack 285wp (the side door ramp toy hauler)