I have the Tekonsha P3, model #90195. It works GREAT(!!) and will work in any position. Normally I'm not one for all the electronics jazz in things, but this unit is awesome. The potential problem I find with units that have to remain fairly level is, what happens when your truck ISN'T level enough? Do you still have trailer brakes? If your model has to remain fairly level, I'd recommend getting a different model.
As for the slider on top, if you ever want or need to apply a little braking action to the trailer without engaging the truck, then you would manually use that slider. You can also use the slider to hold/lock the trailer under slippery conditions (think ice) while you finish backing up to it....assuming your wiring harness lead is long enough.
The dial underneath adjusts how much braking power is applied to the trailer brakes when you hit the truck brakes.
One more thing to consider is that some vehicles to better with one type of controller while others work better with another. These two different types are "Proportional" and "Impulse". The Impulse is also known as a "Time Delay" controller.
I was sold one for a 1996 GMC 3/4-ton Suburban and, as I didn't know the difference, I just handed them my money. I absolutely HATED how it kept surging when I'd step on the brake, but then that's how the Impulse controllers work - with "pulses" of braking action. I think these work with newer vehicles, but on the truck I drive, I gotta have Proportional - meaning if I lightly step on the brakes, I get continuously light braking action. If I hit the brakes hard, then the brakes engage hard! With the Impulse, it works TOTALLY different!
So my best advice is, make sure of what you have, AND what you need (what the vehicle prefers). Also, there is a TON of information on the eTrailer website. I'd highly recommend spending some quality time there. If you're not much for reading, they have a toll free number, and I think also a chat service from their website.
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