TruRyde Trailer Suspension TRBU11561 Review Video

A bushing is not required for the c-hook end (sometimes called an open eye end) of a slipper spring like the 4-Leaf Slipper Spring w/ Open Eye End #e33SR. The closed eye of this spring does have a bushing included; I have added a link to a video…

Most likely your trailer has brakes, but not every single trailer out there does have them. I did some checking though and your Karavan KHD-2990-72-12-PR does have a set of 10 inch brake drums installed so you'd just need a brake controller…

With a few possible exceptions (large fifth wheels that use LT or Light Truck Tires), we recommended that only trailer tires be used on trailers because they have stiffer sidewalls which do a better job dealing with the vertical load tires experience…

A Nylon Bushing #TRBU11561 is not required to be used on the open end of the 4-Leaf Slipper Spring #e33SR. Since the bushing is not going to be fully encased it stands that under the weight of the trailer it will fail and break apart more easily. I…

The Nylon Bushing #TRBU11561 sounds like the bushing that you are needing for the open eye side of your leaf spring. this has a 9/16" inner diameter and the outer diameter is 1.024". This is all nylon with no steel sleeve inside the…

Slipper Springs like #e33SR do not use a bolt and bushing for the open eye end of the spring. It connects directly to the hanger using a slipper spring hanger kit.

Thanks for the picture! The spring shouldn't hit the frame like yours does in the picture, so the correct solution would be to either add a longer front hanger or using a shorter spring. The correct replacement hanger will be dependent on the…

The 4-Leaf Slipper Spring #e33SR that you referenced actually comes included with the nylon bushing but if a replacement is needed then the 9/16 inch #TRBU11561 that you mentioned would be the correct size and will work perfectly. The correct bolt…

The difference is found in the application. The Slipper Spring styles, like part #SP-179275, are intended for use with more heavy duty applications, while the Double Eye styles, like part #e77SR are used to provide a more comfortable ride. The part…

With slipper springs you will want the eyes of the spring facing the front of the trailer and the open end facing the back. I attached a help article on slipper springs for you to check out as well.

There are really only two standard trailer tire sizes for 15" wheels, 205/75-15 and 225/75-15 with the latter being the taller option (28.4" diameter x 8.9" wide vs. 27.3" diameter x 8.1" wide). I recommend the Karrier…

The 7.00-15LT tires you have on your 1978 Avion trailer have a 29.4" diameter, have a load range that should be in the 2,400 lb vicinity and fit wheels that are 5", 5-1/2" and 6". For comparable tires I recommend going with a…