I believe the next size up is a 24" by 24" boxed tree. I don't know how much they weigh but are too large to be handled by hand unless you want to get inventive with a come along, rope, and rollers.

I bought a 15 gal. Anything bigger was too difficult to come by.

i understand it to be 8-9 years old.

nice Hass avo. Let's hope it starts producing soon.