There is only one seam in my garage and a good push gets the loaded dolly over, even with the little steel wheels. No big problem. I don't usually take a dolly w/ a machine on it out of the garage. Machines each weigh 800+ #s and there is pavement in front of my storage garage. As mentioned in the thread I had rubber wheels on the dollys and they collapsed under the weight. I used small steel wheels but if you used larger wheels it would probably be easier to push around over rough ground. No pushing on bare ground or gravel, though.
The dollys are sure tough. There's no give at all, and they are cheap and easy to build. And with the plastic bunk slides which are on the bunks of my trailer, it's a one man job to move the machines on and off of the trailer/dollys. They just slide on and off with very little effort.
Storing the machines inside, out of the snow, ice and wind, during the winter goes far to keep them in good shape and top operating condition. Even though my storage garage is not heated, it's much better than leaving the machines outside under a cover. The winters up here in NW Ohio can be brutal. It's 60 degrees here today! I think my PWC season may have ended but maybe it will warm up next weekend.
former sea doo owner, will never own one again