You'll want it as low to the ground as you can get or extra long ramps or both. Loading my Super C with 7' fast hitch disc on to my 20+5 goose neck was spooky the 1st couple times I loaded.1st gear and just above idle my front end came up. Fortunately every thing happened in slow motion so no harm done.
Make darn sure your brakes are locked together and properly adjusted to apply evenly.
I drove it on with the disc down for several trips and that worked fine. However I hated backing it off the trailer. I now back it on the trailer and drive it off. Much more comfortable to me.