1991 GMC Safari Vehicle Engine Heaters

The correct replacement for a Demco Master Cylinder 05680-C is the Replacement Master Cylinder part #5650. I spoke with Demco to confirm this for you.

The correct replacement master cylinder kit we have for your Demco setup is the part #DM5918 which comes with the lock out replacement.

Brake systems are not dependent on the hub bolt pattern. So you can use the Electric Trailer Brake Kit #AKEBRK-7-SA for 12 inch hub/drums or #AKEBRK-35-SA for 10 inch hub/drums. Then use #10-1-1 wire sold by the foot for your brake magnet wiring.…

I agree it is the right time to upgrade to a Lithium charger/converter as not all are Lithium compatible. I recommend using the Progressive Dynamics Mighty Mini AC/DC Panel and Converter/Smart Charger - 60 Amp #PD4060K which is a replacement for…

On a single axle trailer you will want to have a hanger spacing of around 22-3/4 inches when using the 23-1/8 inch long Double-Eye Spring #e59SR. This will allow that rear shackle to correctly lean away from the axle for proper suspension travel.

On single axle trailers typically you put the hanger spacing right at 1/4 of an inch shorter than the leaf spring length from eye to eye center. So if you were using the leaf spring part #e54SR that you referenced which measures 25-1/8 inches long…

Thank you for purchasing from etrailer! You did a great job selecting compatible parts. When using Leaf Springs #e64SR with the #AP233 Equalizer Kit and the #H248 Hanger Kit, there should be…

You do not want to use a holding tank heater like ThermaHeat #277-000164 on a battery but we do offer battery heaters specifically intended to protect one from extreme cold. You can see all such items on the page I linked for you.…

To determine the size of the brake assemblies you need you have to measure the depth and width of the hub drum on the axle like what you see in the picture I attached. The most common size is 2-1/4 inch wide like the #T4071600-500 that you…

From the looks of the photo you sent it does not look like you have an OEM suspension system on your boat trailer. I recommend securing the suspension rail to the trailer frame in a more secure manner like drilling and using bolts so that it does…

I would be happy to help you set up your 2022 Toyota Highlander to haul your new travel trailer. The wiring harness you currently have controls your…

It sounds like when the Redarc Tow-Pro Elite Brake Controller #RED44FR was installed on your 2022 Toyota Highlander that they may have damaged the brake signal wire or tied into the wrong wire. I recommend taking it either back to the shop who…