Hiya
Have the printout in front of me 
The manual works by considering profile first, then tyre width and then lists acceptable wheel widths
For 255/35R20 tyres the recommended width is 8.5" (J profile, but they all are basically unless they're very specialist)
The alternate approved rims are 8", 9", 9.5" and 10"
If you wanted less evident stretch the recommended tyre width in a 35 profile is a 285 but you'd need to check rolling radius to make sure that wasn't going up a lot (it probably doesn't)
If you pm me your email I can send you a copy to keep in the car in case you're stopped again? Won't deal with the bodywork issue but it should deal with any suggestion the tyre is too stretched
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