It might end up being that it would be a similar time to just swap bags as opposed to vac’ing out but i don’t have any data on that… As far as the abitity to handle the weightt goes, I know there are suppliers that will customize them for you to handle most any capacity you desire. I was previously in talks with the guys at Boldt bags to create extraction bags formed to line IBC totes and lift out with a fork lift similar to the soil totes that you can pick up at the grow shops. I ended up scraping the project but i don’t see why this couldn’t be applicable to your needs.
Happy hunting