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i have one of these: https://www.etrailer.com/Trailer-Brakes/CTS/HBA-10.html
on my car hauler with falcon 5 lug drum brakes on the wheels.
got the master used from a trailer store for $100, and the drum brakes off of a parts car for free.
$100 is a heck of a deal, I'd written off electric over hydraulic largely based on cost. Though even if I can find a deal like that I'm not sure it's right for me. I tend to prefer rugged KISS solutions, I know this RABS thing may not come across as KISS but to my mind it is. I'm just retaining a stock system with a slight modification that appears to offer a simpler more reliable solution to the reverse issue then the typical tongue lock. More importantly a failure of the RABS is unlikely to cause brake failure.
If I went that route I'd have to buy another controller, I have one but it's old and kinda sucks. I should get one anyway, just not the top of the financial priority list.
The one thing those have that I see as a HUGE plus is the ability to apply the brakes independently from the cab. I have an idea for that for later, need to get this done first and need to decide if I'm going to use the RABS. Which I think is a BIG yes, heck even if I changed to electric over hydraulic I'd like to use the RABS.
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