Not easy but I'd life my spouses mother from the chair and carry her up the steps into a motorhome - later into a 5th wheel we bought. Then I'd carry the wheel chair. She was less than 100 pounds and I was younger and stronger then. Not the ideal way of doing it.
Bob, Sandi & Marmaduke the Big Pug
SW OREGON 2004 Journey 39K, 330 Cat
If towing: a 2006 Mini Cooper or 1995 Wrangler