not a CRD, but I've towed something similar to you (20' closed deck steel with a car on it) several times.
I have a MaxBrake (
https://www.southwestwheel.com/p-3084-m ... oller.aspx) but I don't believe you can get it any longer.
If mine ever fails I'll be stuffed for finding one i like.
There used to be a few ODB2 connected ones that worked really well, but I don't see them any longer.
I've been out of the brake controller game for a long while, sadly.
eta:
https://www.etrailer.com/Trailer-Brake- ... L-100.htmlthat's the style of one I'd be looking at now it seems. it's ODB2 connected to it can read your brake pressure supposedly, instead of relying on some external sensor that's based on motion/inertia.
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2007 Jeep Liberty Sport 4x4 3.7L 6spd
- MOABs with Goodyear Wrangler All-Terrain Adventure With Kevlar 245/70R16
- JBA UCA 4.5
- OME 790/948/90009/N32
- Western Suburbanite 7'4" plow
- DetoursUSA Backbone
- HF 12k# winch
[SIZE="1"]WTB: project liberty near N.NJ. stick shift, 4x4, working motor optional,
CHEAP[/SIZE]