In order to choose the correct disc brake conversion kit for a 2018 Jayco Seismic 5W Toy Hauler, you'll need to know your axle capacity. This can be found easiest on the axle tag which requires crawling under the trailer. I looked up some of the different floorplans and would estimate that you have 7,000 lb axles, in which case the HydraStar Disc Brake Kit w/ Actuator for Triple Axle Trailers part # HSE7K-TR1 is what I recommend for a complete kit. It comes with everything you need; actuator,... view full answer...
I see what you mean now. So for replacement self-adjusting brake assemblies that fit the 7k axles of your 2018 Jayco Seismic 4212 what you would want is the part # TRU96FR and you'd be set. view full answer...
We do have replacement hub/drums that fits your 2018 Jayco Seismic 4212 that has 7k axles with the etrailer part # AKHD-865-7-G-EZ-K. You'd need to order a quantity of 6 of these and the price is available down below. view full answer...
I do have an option for you but the Convert-A-Ball Cushioned 5th-Wheel-to-Gooseneck Adapter part # CAB-C5GX1216 isn't compatible with cushioned pin boxes which is what the MORryde 5th Wheel Pin Box is. If you want to switch to a gooseneck connection then your best option is something like the Gen-Y Hitch 5th Wheel to Gooseneck Pin Box part # 325-GH-8045. Please note, this will replace your existing pin box and in order to be sure you get the correct one you'll need to know the pin box model... view full answer...