My club (The Maine Highlands Sled Dog Club) has several fun runs and races every winter and a couple of teams come to them from southern NJ and Maryland. The Jersey folks never get to run on snow, but usually have the fastest team in the event!
Those Arctic rigs, aka "gig's" are really lightweight, the heaviest being less than 60 lbs. Great for racing, but for training - not so much.

Back in the day, an outfit named Ridson, used to build both training and racing rigs. As you might suspect, the trainers were a lot heavier than the racers. I think the training ones had a way to attach additional weight(?).
When I ran big teams on land, I always used a 2 wheel drive, '92 Polaris ATV. It was heavy enough to give them a good workout, but not too heavy. Having 4 wheels, it was stable and could be kept in gear with the engine running to help them up steep hills. Being able to lock the brakes was a big plus if dogs had to be moved around, or a tangle needed to be undone. I did build a 3-wheeled rig out of an assortment of junk pipe and car and motorcycle parts, but only use that to run 4-6 dog teams. It weighs almost 200 lbs, but once it's rolling it'll fly!

Nowadays I just do a little gig training in mid-late Nov, then switch over to a sled after there's enough snow on the ground to put in a decent trail. I do run on some of the local snowmobile trails, but also maintain about 10 miles of trail just for my team. That gets done with a pipe drag and a '98 Arctic Cat 550, Bear Cat. Absolute beast-of-a sled, with a 20" wide-long track, and a variable-ratio clutch. It'll go anywhere and through anything, but at 540 lbs when it gets stuck . . . it's stuck s-o-m-e hard!

Needless to say, there's a hank of heavy rope, a shovel and a come-along tied on the back just in case that happens, which is usually at least once a winter - phooey!
Chris Mitchell