Long ago, before there was such a thing as a commercially made motorcycle lift, I was a motorcycle mechanic. I worked in a number of shops where we used wooden benches, about 18" high, made of 4x4 legs with 2x6 skirting and framework, and 3/4" plywood tops.
We'd use a simple plank as a ramp and wrestle everything from little Honda mini-bikes to full-dress Harleys onto those benches, and they worked just fine.
I got a lot of greasy splinters, and a few bikes resisted staying put, but all in all, they worked.
What was fun was getting a big heavy bike up there with a flat rear tire, then getting it onto it's center stand, and then dragging it backward on the bench until the wheel was back far enough to drop it out of the bike. Ah, the good old days . . .