In a past life I used to own a carpet cleaning and building maintenance company. I regularly had to make the same types of measurements. I used a roll-a-tape instead. If something is in your way, just move aside and keep rolling. Works like a charm.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280