Well...there are some variable here that need defining. "Off-trail to some" means tearing over hill and dale up steep and down ravines where steering is done mainly by standing and leaning one way or the other.
In this situation, as others have said...don't waste your time on a 2fer....they aren't made to do any of that.
However, if you are looking for a sled that will stay in the tracks of others, which makes a HUGE difference, or need to carry an occasional rider..kids mostly...or you need to get your gear 2 miles down the backroads which are not plowed or ridden on...then you can make some of these 2fers work remarkably well.
Yes they are heavy, but they are forgiving too...I own two of the cat non-turbos with 136 inch tracks and 1 inch lugs...and in all but the super deep...4 feet of untracked powder...they have been just fine. We pull the rear seat, throw 2 5 gallon gas cans in the back...duffle bags and more stuff than I care to mention going and coming and they put the one up sleds to shame...they are the sleds of choice for utility. Arm yourself with a good utility sled with longer track and longer lugs and you will be amazed where they can go, or what they can do...if but a bit slower getting there when you have to use it in a gang on the trails. Off trail...speed is not as important...getting there without getting stuck...is important.
As for weight...getting stuck with the lightest sled out there is no fun in deep stuff. It requires an army, or a good winch. Not fun...and after a couple sticks...the cabin and tv set starts looking far more entertaining.
What most of these sleds lack...especially the two ups...is good skis up front....but simmons has a nice 10 inch ski that transforms the lousiest sled into a decent performer in the powder...
Also there is NO substitution for experience when you are going off trail. If you hesitate, or go too slow...stick city! An experienced rider can make it happen when a novice will cause heart attacks on every turn.
More and more folks are learning about the utility sled options...and though they are heavy, and they don't turn worth a hoot...they have power like a mule in a harness....and that isn't all bad.
I am always taking folks who have little experience on sleds....showing them the back country and the views that few would ever see....because I like to do that, and love the high country myself, I use caution and give very detailed instructions...which sometimes gets followed, but hey...that's what they make shovels for isn't it?? After a good weekend ride, they are far better at getting around, and they are hooked...and always ready for another trip to the hills....
I am proud to have been the one to get them started.....it's good for the sport and if done with reason and care...mostly a pretty safe and enjoyable time is had by all.
Give it a try...worst that happens is you have to sell the sleds to a hungry market...which are always looking for 2fers...there are not enough of them.