I see there are companies making a discreet hitch for the 5 series - I wonder if it would work on the M5... maybe different exhaust, etc could be an issue.
https://stealthhitches.com
INterested in an M5 but definitely need to transport two mountain bikes
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2023 330e, 2016 X5 50i Msport (SOLD), 2011 E90 M3 (SOLD),
BMCCA, F1 fan (Montreal every year)