Since the ones I've been to were not disturbed by sever weather I don't know about the other questions. I do know that the extraordinarily long graveside sermon given at my sister's funeral did not incur extra charges. Neither did the delays caused by the two women that fainted at that service - it was late June in Florida and very hot and muggy so the mourners who did not have shade were very heat stressed.
We managed to get pall bearers from family members - for my father and mother (separate services years apart) my husband, BIL, nephews and nephew in law were the pall bearers. I am not sure how it's handled if there are no relatives to do that job.
The small town funeral home that handled all my relatives' funerals has various levels of service that depend on different factors - if the service will be at the funeral home or a church, if there will only be a graveside service, if they have to contact the closest military base for the military send off (both my parents had that), and more.
While I was there for planning my Dad's funeral, we pretty much went with one of their all inclusive packages - service at the funeral home, they transported flowers and everything to the grave, graveside service (grave digging and refilling handled by the private cemetery), and so forth. They did not break it down for us at all.
My mother in law, on the other hand, was cremated and the family decided to take their father's ashes out of the vault where they had been since he died in 1973 and replace them in a nice bench with hers in a different cemetery. The bench has room for two more sets of ashes and my BIL and SIL are planning to be placed there eventually. They did have a ceremony at the church where one of her daughters is a member - NOT the Unitarian Church MIL had attended for decades - and the internment was done with a family gathering several months later.
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