Originally Posted by Nut501
Thanks! Can you please explain the difference between the P2 and P3?
I think the P3 can store multiple settings for different trailers or weights. E.G setting 1 for flat bed trailer empty, setting 2 for flat bed trailer loaded with heavy earth moving equipment.
What some might consider a nicer LCD display with words rather than codes. Has more buttons to navigate the menus and settings. Which may be easier to use.
Cost $20 more.
But functionally I have to agree with Carol not going to make much difference for towing our campers.
I think the main reason the older style time delay controllers still exist is because they have gotten so cheap. Less than $50 for a name brand controller.
Early proportional controllers used a pendulum to detect deceleration and thus where very touchy about position which may have given them a reputation with some people for being unreliable. Now they use pretty much same technology as smart phones use to detect motion.
There could be some situations where one wants to mount the controller sideways on the dog house of a commercial truck or some other odd orientation that would not work for a proportional controller but would with a time delay. The other one scenario I have heard mentioned is hourly employees tend to break stuff in commercial trucks, they kick it or hit it with tools and replacing a $50 controller beats replacing a $125 controller.
But for our uses I don't think it makes sense to waste money on a time delay controller unless price is a huge consideration and you figure your trailer use is so limited you don't need much beyond "it works".