Safe or scary to roll a big bike up and down an 7' TH ramp?

It can be a little nerve wracking the first time, but it gets easier the more you do it.

I use front and rear brakes when I back my bikes down. Using just the front brake usually doesn't work very well because the front tire will just slide. Although you may not have that much of a problem because the ramp angle will be less than my 5th wheel toyhauler. Then just ride it back in. Easy, peasy.