Hauling your Raptor behind a MotorHome.

TrailWhale said:

Correct, it uses inertia. Just like a surge brake system on those uhaul trailers.
Ive towed my truck up and down mountains and have not experienced any issues with engine braking and the truck brakes overheating.

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I just read this from https://www.trailerlife.com/towguides/controlling-trailer-brakes/

An inertia-based proportional controller generates an output that is, as the name suggests, directly proportional to your braking needs. Most proportional brake controllers measure the tow vehicle’s rate of deceleration by means of a pendulum. The quicker you slow, the further the pendulum is displaced, via inertia, from its at-rest position. This creates an electric signal to your trailer’s brakes that is proportional to your deceleration rate. Tekonsha and its sister companies use a series of LEDs and photoelectric detectors in their proportional controllers to determine the position of the displaced pendulum, and therefore determine the deceleration rate. Hayes-Lemmerz uses the Hall effect, a well-known physics principal involving moving magnets, to determine the pendulum’s position. All pendulum controllers are subject to some inaccuracies, as the pendulum can tilt slightly forward or backward on steep grades. Most such controllers employ a damping device to stabilize the sensor against vibrations, and the damper helps reduce the effect of the fore-or-aft-tilt problem. The pendulum’s position is adjusted through the level-control knob. This allows the pendulum to be oriented to a true vertical resting position to compensate for the angle of the brake-controller body (the “leveling” referred to in some timer-based-controller advertising). The level adjustment also allows the driver to pitch the pendulum slightly forward or aft of its normal resting position to set up the trailer so its braking is aggressive or delayed.

So it's possible that the RViBrake3 is smart enough to know you are on a long down grade and handle it correctly. If I'm not mistaken this technology is in every modern cell-phome today.

Mark Hounschell said:

RViBrake3 is smart enough to know you are on a long down grade and handle it correctly.

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Possibly, but probably not. As far as surge brakes (like the U-Haul) that is why you see skid marks on the freeway at every "dip", the surge brakes are locking up and skidding the tires. Not to say that happens with a proportional braking system, but just because it is proportional doesn't mean it will brake as you are using your engine brake (on a diesel MH). I use my engine brake 80% of the time, not my MH brakes. Just my 2 cents worth.

Go read up on the RVIbrake3 and call them. The unit knows if it’s going uphill or downhill. I used it towing my lx470 12k miles and had 0 issues in some of the steepest roads in the country. It’s fully adjustable to your rig, weight etc. and you can test the unit by hitting the “test” button to see how hard it brakes. I ran it on the lightest setting as I use my engine brake 85% of the time to slow everything down anyways. It’s more for legal issues and just in case it disconnects in an accident or tow bar failure. In fact, I just bought a land cruiser again and will be using the rvibrake3 in that truck.

kpecks said:

Go read up on the RVIbrake3 and call them. The unit knows if it’s going uphill or downhill. I used it towing my lx470 12k miles and had 0 issues in some of the steepest roads in the country. It’s fully adjustable to your rig, weight etc. and you can test the unit by hitting the “test” button to see how hard it brakes. I ran it on the lightest setting as I use my engine brake 85% of the time to slow everything down anyways. It’s more for legal issues and just in case it disconnects in an accident or tow bar failure. In fact, I just bought a land cruiser again and will be using the rvibrake3 in that truck.

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From the RVIbrake3 manual:

The slope sensing software will keep RVibrake3 from being more sensitive
downhill and less sensitive uphill, giving you accurate braking at all
times. This software keeps your brake pads from having excessive wear.

For sure the AFO and the RVibrake3 appear to be the best 2 choices. I appreciate all the input. I still have a couple of years before I will have to decide.I'm still not 100% sure if I'm gonna trailer it or not. I've learned quite a bit for all here. Thanks.