I feel the pain. The 6.5 smooth Italian Carboys are a both blessing and a curse. Love having the larger size (mine is closer to 7gal actual vol) but the width and different neck can be awkward. They make special larger handles that fit around the main lip. 6.5 Carboy handle. They look exactly the same as standard- just bigger. The 6.5 necks do seem thicker and stronger imo too.
when putting wine thru cold stabilization in my shed I put my Carboys in milk crates. The 6.5 got so stuck and I killed myself trying to remove it. I should get a larger crate like what @Jim Welch mentioned. Other than that I don’t think there’s any other special tricks for them that would be different than a standard 5-6gal View attachment 77430
I have those as well and if they are the ones that fit snug in the milk crate they are 7 gallons. Mine have a 30 on the bottom them. Originally I thought they were 30 liter but they are not. It's almost like a milk crate was made for them.