Does anyone have experience running an alternator, water pump, and Sanden-style A/C compressor all with a single v-belt? If so, how long has the belt lasted?

This is how my Crestline came to me. Seems like a single belt would not be up to the task of running all 3 for very long.

1954 Crestline Victoria 312 4-bbl, 3-speed overdrive