We have a weekend neighbor that uses a tow behind, I can not say I have looked at it up close. I can ask him about it next time he is up.
I have an old L1 Gravely with most all the attachments, I sure do not like trimming around the cars with the sickle bar any more, damn that goes through the sidewalls The 30" rotary is impressive, I have only used it to edge with. i no longer tackle much over 1¢ with it anymore. I generally use my 1973 Kubota L225 with the 5' hog, I generally chainsaw the larger stuff but trim the stumps down.
I really prefer to run a hog on the Kubota rather than an 8N, It just drives better and I have more gear selection so I can control the feed to the mower better, especially when doing the larger drive overs or chewing stumps.