I would reach out about the actual weight of that ramp - the listed weight on that product page is 1.37 pounds, and I know that cannot be true. Those types of portable ramps can easily exceed 35 pounds in weight, and can be difficult to safely utilize without a second pair of hands.
@
suzzzze, I would check directly with any rental vendor you are considering using - ask (for example) Gold Mobility if they have any units that can be broken into smaller "sections", and what that heaviest section weighs.
Lifting that heaviest section into your car from the ground, and back out of your car down to the ground is what you have to overcome.
Remember that you will have to be able to assemble that
ECV on your own in the parking lot, and then take it apart at the end of your visit when you are ready to leave for the day. If you think that is not possible, I would strongly suggest that you consider staying on-site at one of the WDW Resort hotels, and using Disney's free internal transportation for your rental ECV; that way you don't have to worry about anything but your personal comfort when choosing a rental device.