I had started out with an open snowmobile trailer. It was hell on wheels.
1. it would take at least 15 minutes getting the cover I had for the bike&snowmobiles on and even then, as one had mentioned above, the road chemicals/dirts still got on everything and would/could make its way up under the cover. Never mind having to deal with the cover straps in the freezing cold, with a wind chill, then after traveling in the slop, the straps would be frozen, stiff, all crudded up, the cover-deal was one nightmare.
2. Dragging the bike off the tilt bed trailer, while a LOT easier than having to deal with a taller ramp going up to the bed of a pickup truck, still sucked balls. All it would take was the front to either catch an edge, and even with the wheel kit on the front ski, it was no walk in the park as the handlebar/ski wheels would turn and the bike would end up on its side. Nightmare #1.
3. If would snow, or rain, and the deck would get all slick and then there would have to be shoveling to clean the deck.
I had realized the only solution, since I knew that I would use it all the time, was to get a 7x14' + 4 1/2' V nose enclosed tandem axle trailer with a front-V ramp door to make loading or unloading the machines from either the front or back a ride-in, ride-out affair. My god, no more needing to cover the machines. I have Bike Binderz and the L-Track all over my decks so I can take either 4 dirtbikes or 2 snowbikes or 2 snowmobiles or any combination, easily and be able to load or unload in probably less than half the time as before.
With all the caliber decking stuff I have to channel both the snowbikes and the snowmobiles, it all works to make the load/unload so, so easy and the expensive machines and all the gear is all protected from the elements and it is nice having all the room to bring whatever stuff we might need for both winter and summer fun.
I can totally understand the whole trailer-thing as some don't have the space/room to store a trailer, not to mention a $6,000-$8,000 price for a 2 place enclosed V-nose trailer, never mind the maintenance-even though the maintenance is easy on a new aluminum trailer, protecting the machines from the crap on the roads/highways, and the time saved covering and strapping machines then loading and unloading is totally worth it in the long-run.
I could easily fit 4 snowbikes in my enclosed by just staggering them inside the trailer but can only fit one snowbike and one snowmobile as the sled just takes up too much space on the floor.