I did my first Wedding in the mid 1960s then up till the early 2000 and like all photographers of that time we used a medium format camera. Bronica , Hasselblad, Rollie with just one lens a standard 75mm f2.8 and 8 rolls of 120 film 12 exposures.
Why do todays wedding photographers have to carry 5 lenses and take 2000 pictures, how many of those pictures get into the Brides album, how many hours are spent at the computer sorting them all out. We perfected our technique with leaf shutters and shooting with both eyes open every shot was perfect no shut eye pictures of the bride.
Use a standard lens and perhaps a wide for a group inside, Have two bodies the same and two flash guns, spare batterys. Concentrate on the posing of the people not on how many lenses you can use, be able to adjust your camera and flash with out looking at them so you can do it in the dark if need be.