I see a lot of folks here seem to think if you leave it low gear that it will not pick up speed on the down hill. With the weight of the mh and toad you will continue pick up speed. Just completed a trip thru Az co , ut and went up and down many a 6-9 % grade with a 4 door jeep in tow. On the steep up hills found 1st gear at 3400 rpms was fine ( 20 mph) and down hills let get to about 35 to 40 mph and then hit the brakes and slowed to about 15 or 20 mph . Did not let the motor rev to over 4000 rpm. Wife really got annoyed at the roaring of the cooling fan on the up hills but I told that it's Avery good sound!