I have the trailer assist option on my Disco however when I try to enter the trailer size into it it accepts the size from the trailer hitch to the axle but no matter what I enter it won't accept the width of axle. Spoke to the local dealer who doesn't know why either. Any ideas ?

 

Did you ever find an answer to this? My 2019 seems to be doing the same thing.

 

Our 2020 does the same thing. According to our dealer, we have to have the paper target in place on the trailer before attempting to define the trailer. Sounds odd, and never got a chance to try it—summer fires and then COVID have prevented all that fun.