If only we still had looted tanks they would have been perfect. Now, they are a bit thin for battlewagons and too badass for trucks. GW
needs to get of its ass and provide Orks with a mid-size battletank. Every other army has one and so did Orks,, but it fell through the cracks of time. Maybe you can get your hands on a ruleset for the looted tanks, if not, I would go for battlewagon.
To be more acid, I would say it had to go so GW
could release a Space Marine model which overlap so strongly with another that they are now forced to softly reboot their flagship faction (and risk repeating the cycle again as their game and media are still completely centered on them).