I have seen 3-4 stack set fit into a 90’s JETTA.
Also, a mid 2000 Toyota Highlander. You can fit a 7 footer in the middle, 3 6 footers, step ladder (4 footer), and 2 little 4 foot sectionals (a bottom and a middle, sideways)-- also all your tools, and a crate for your DI tank…oh yeah, and your 2 WFP-- AND 3 PEOPLE in it…comfortably and workable!!!
Mid 2000s Nissan xterra SUV-- Plenty of room, but best with a ladder rack. You can fit quite a lot if you can fold the seats down in ANY SUV, believe me!
I have a Nissan pickup. Great truck. If I could do it over, I would find a good truck with an 8 foot bed-- but am loyal to Nissan and will continue to be for decades… In my truck I can fit 5 pieces of ladder (four 6’ and 1 8’ head), a 6 foot step ladder on the bottom, a 4 foot step ladder, a 2 foot step ladder (Stacking on them), a 75 foot hose, my Tucker pole, and my Garelick 24’ pole, as well as my little 12 foot Ettore stick. I keep 2-3 buckets in the back for my tools and extra fresh water, and all of my rags and anything else in my cab behind me.
Once I get a newer Nissan, I will buy a ladder rack that I can remove as I please-- I don’t like driving with the 8 footer hanging off 2 feet-- I use tie downs and a lock but if something ever happened that 8 footer is going into someone’s skull lol.