Bobcat do a towable 1 but no high flow, I've enquired about a gehl and manitou 1350 same machine different letters but no reply or answer to my questions which is pretty poor, makes you wonder what their after sales service would be like!Don't know the price but I think all posi tracks are high flow, this is the biggest towable one I think
But they do some really little ones
Economical meets versatile with the all new RT-50 compact track loader. Featuring a powerful, lighweight design to help you get the job done on a variety of terrains.www.asvi.com
Or I know no one really wants to operate standing up but would the biggest ditch witch be nearing what you want??
800kg operating capacity and over 2t tipping capacity so not quite as good as an avant but getting there.