You won't be dragging walker or wheelchair onto the plane. If wheelchair you will automatically be placed in the pre-board line and taken down the jetway by an attendant (or a family member), assisted into a seat (not exit row) and your wheelchair will be checked like luggage (not inside the plane). Upon landing you remain in your seat until the other passengers deplane, and they will have your w/c waiting in the jetway. Similar with a walker, I believe. They will bring a wheelchair to get you through the jetway and into a seat, walker will be checked, given back to you when you deplane.
Hope your situation improves and you won't need either, but better to have it if you need it.
There are companies that will deliver wheelchair, scooter, whatever you need, to your hotel, and they pick it up after, if that works for you. Many others here can better attest to those services and prices.