Open trailer

All you will have to do is:

-Get a moving blanket (or two) and drape them over the front of the bike.
-Get a Tarp and bungie cords and cover the bike (or buy a snazzy Bike Cover)

The moving blankets will act as a 'bullet proof' padding under the tarp (or cover). This should protect your bike from all but golf ball sized rocks (and if they are that big there are probably more problems going on).

I did this with my harley on the back of a small flat trailer. No problems after a 1900 mile trip...

Worth a shot.

I towed a bike on a open trailer, once!!! Salt air & a 3 day monsoon plus the tarp blowing destroyed my bike,out in Montauk NY. Got a 7x12 dual axle enclosed that week when I got home. I carry my ol' 7.5 out board inside with lots of other "stuff", the jon boat on top,DW's bike and mine. 14 yrs. latter still a great choice. Only regret; everybody knows I have a pick-up,and trailer.

If you have the open trailer you could use a Gatorhide on the wing.

clicky

If I already had an open motorcycle trailer, I would create a 4' high plywood surround just large enough to enclose the motorcycle. Then cut out the necessary holes to pass the tie downs through.

The road gets better all the time and is mostly paved. The frost heave and permafrost up North makes the road rough. The sections being repaired are gravel. There are lots of trucks sending gravel into the air. There really are not that many paved roads in Alaska. How is the Gold Wing on dirt roads? If it were me I would leave it at home. Sort of like taking a knife to a gun fight.

Definitely go with an enclosed trailer if you are going to tow your Goldwing all the way to Alaska.
I have been towing bikes for 5+ years {first my BMW R80 RT, then the HD Dyna Super Glide and now my Indian Springfield}. I started with an open homemade stake bed {Harbor Freight}.

The next trailer was a nice Kendon folding single that due to the long overhang of our 24' Class C, protected the bike completely, not a scratch in three years and 20K+ miles but...

When I got the larger Springfield the Kendon was working way too hard so I upgraded to a 6 X 10' {14' overall) enclosed trailer. This for me is the perfect combination. The bike is completely protected {from weather, debris and bad guys etc.,} as basically, I'm traveling with my own custom garage attached.

In addition, the trailer has lots of extra room to swallow misc gear from the coach. My BBQ, firepit, LP cylinder, camp chairs, and rug just to name a few easily slide into the trailer. As noted, find a deal on a used trailer, use it and you can probably resell it for close to what you paid.

Here is a shot of our set up taken last January out on the Colorado River at Buckskin Mountain SP just north of Parker AZ:



This set up works so well, can't even see it in the mirrors and fully loaded {Bike, trailer and gear} it weighs just 2,220#. I just have to remember I am now 38.5' instead of the usual 24.5'.

:C

Thanks for all the comments. Looking for a preowned enclosed trailer

You can enclose the trailer 4' high pretty easy, like jimh suggested. That's what I'd do. Fairly easy to tarp it too, idk how tall the windshield is.
You can do some awesome touring up there for sure. It'll be phenomenal. But my preference would be to bring a dual sport instead or in addition if you like to ride. There's more miles of brown roads than black up there.

NO! ...don't do it! Get an enclosed one and there are many reasons why but my single axle 16 ft.is awesome. I have both, my other is a dual axle open utility with outside rails but it is just that, it carries wood and stuff when you don't care about road debris and weather. Storage and safety is worth the investment and you can lock it up for piece of mind. If this is you first trailer, invest. I can't say it enough...trust me. Check my profile pic...sorry I would show you other examples but the pic function is not working correctly....

I rode a HD Road Glide San Diego to Fairbanks and back in 2004...Rode an Ultra Classic San Diego to Anchorage and back 2010...Not one single scratch or ding....Much work however removing the white stuff they coat the roads with to cut down on dust etc....

I would not hesitate to trailer a bike to AK....use some minor precautions and all should be fine..