A few ?'s about offscreen Happy Days

[Cactus Jack]

If anyoen knows, I owuld liek to know the answers these Behind the scenes, offscreen Happy Days questions I have

Here they are

Were Anson Williams and Donny Most as big of goofballs offscreen as they were as Ralph and Potsie, and got alnog as much as them?

Did Anson Williams make up any of their scenes?, like the Biff and Duke scene looks like they probably made it up

Did Donny Most actually write those joeks he told as Ralph Malph?, if he did, they were hysterical, if he didn't who ever wrote them, those jokes were hysterical

Did any of the cast members jokingly call themselves by their
character names?

What kind of pranks did the cast play offscreen? ( because I read on a Suzi Quatro site the cast was known for playing many pranks)

Was Donny Most the funniest guy on the set?

What is the thing about Erin Moran that was mentioned on the secrets of HD thing? I do not know becauseI only strated watching HD last year in August

How sad was it for the cast when Ron and Donny left?

Who was Henry Winkler's stunt diuble, if he had one when he made those jumps over the garbage cans and the shark tank?
THat's abotu it, just curious, if no one knows, or if no oen remembers that's okay, I just was curious