I would say do not use cover, and tarp?? Never! Why? You will scratch lots of things.
You will need lots of movers blankets and wrap it nicely and tight and then you can put tar and try to secure it as much as you can not to move. If the end of tarp has free play, and its constant in one way, it can warm up a lot. I would leave it open or get a plastic wrap like they come paccked or the one that we use in kitchen if you wamt to protect color from some wet weather!
I used to drove flat bed trailer on my semi truck and i used to tarp every load and chain it or strap it!
When haul my bike on my open trailer on my pick up truck i put 4 straps and front wheel chock! No problems for lots of miles.
2013 Suzuki Hayabusa Limited Edition
Gone, but not forgotten,
2008 Honda CBR1000RR