Still the safest way of loading any drive able bike into back of a van, walk the running bike in 1st gear, walking alongside it. Just as easy in reversing it back out.
Did that for many years, without incident., nice ramps, they look well made too.
If vehicle is being used as a permanent bike delivery service then a ramp that folds down/up from rear of van, which can also be locked in situ is another form of defence against bike theft. Simple modification.
GLWS.