Any van can be converted to have a ramp or lift to save money. Used lifts and ramps are available. Still a cost saving even if you need to pay someone else to install it. A fab shop can make a fold up ramp fairly inexpensive if a ramp is enough for your needs.
“Any van can be converted to have a ramp or lift to save money.”
True.
However, if you are converting a mini van (any minivan) do not forget to beef up the suspension. Most of them are way too soft for the added weight of the conversion kit.
Hell, if I were converting a 1/2 ton van I would at a minimum beef up the rear.