Alot also depends on your definition of deep snow. Here today's packed snow is likely to have 3' of fresh snow on it tomorrow. Last winter we had over 20 feet of snowfall with much of the winter having over 50" on the ground.
If you want to feed out on pasture here you can't be dragging things behind you unless they are well above the snowline.
I demoed a hustler chainless last winter and made it 100 yards into the field before that anchor stopped me dead.
Yeah, the Hustler chainless is a decent unit... and the Tubeline is very similar. But they're still limited to "two bales", unless you go to their BaleXpress or Combi Units (also good pieces, IMO). But dragging anything along behind, in deep snow, can become an issue. And you don't get the additional weight on your drive wheels for added traction... so like Chevy says... it becomes a boat anchor. When that happens, you'd rather be making another trip back to the bale yard!
Chainless X5000 8-bale Retriever/Feeder
8 Bale Retriever
Hustler sent me these videos... they've got a few guys down in Nebraska using these. And I'm NOT trying to "poo poo" this rig... it IS a halfway decent machine. But notice how they're demoing it for this video when there's no snow on the ground, or soft, muddy fields. Anything will work when you're operating in a paved parking lot! I'm just trying to analyze it, and see the potential negatives of the design.
Notice that as he backs into his row to load, how the row "creeps backward" some? Can you imagine trying to load a single bale (so not a row of gathered bales), if you already had nearly a trailer full? Just getting lined up would be tough. Consider how much space you'll need in front of your bale rows in your bale yard, just to get "lined up" to recover a load... not everybody has that much space allowed. Imagine how this would go if trying to line up and recover bales from bale rows that are drifted in with snow, in an icy, deep snow covered yard in the approach to the bale rows. Notice how clumsy the rig is, being as long as a semi? Imagine how much space this rig would require to store in the shed each night. Notice the "dualled up tandem wheels"... great for flotation, but what about in deep snow? Or if they DO start to go down in mud? This trailer was originally designed for hauling "gathered" bales off of a firm, dry hay field to storage in the summertime, for the most part. Did you notice that he has to climb up onto the frame of the rig to cut the net off (from each bale, individually, each time he's going to load one into the unroller)? Now think about how that's going to go, when you've just run a mile or two down a slushy road getting to your pasture, when it's below 0... and the frame is iced up. And then think about dragging this rig through 2' of snow, with all those bales that far behind your traction rig. I'm not suggesting that if you've got enough rig up front, that you can't "git r dun"........... but "is there a better way".
Now, consider that, and weigh it against let's say... something that carries 3 or four bales along with you right on the tractor only... like Chevy does for example, or maybe like what Silver posted.
Four Round Bale Transporter Maybe there's another design, that can accomplish the task even better...
I don't think it's practical to think of carrying TOO many bales on the tractor alone, it'd have to be within reason. BUT... THAT CONCEPT (doing it all with JUST the tractor only) has some really strong benefits too.