Albie, they do fit the H2, I put the one on the front and looks like it has plenty of room.
I also pulled that wheel up on a RR tie to see if it hit anywhere and still has 1" clearance.
We had a set of 18x44 ground hogs on a Chevy truck and it did great in snow or mud.
Dad has a set of 18X39.5 Boggers on his truck right now but I'd need a little lift to put them on the H2.
The tires REALY change the appearance of the H2
I took some pics but they are at home.
The only reason I am checking is I can save about $400 over a new set.