Here are some threads on the LF forum discussing various carrying equipment with opinions on the benefits and liabilities.
I am now 72 and have used the baby jogger in my posts for five plus years carrying 4x5, 8x10 and 7x17 cameras already mounted on tripods with a bag of lenses and up to seven 7x17 film holders. For me it makes ULF possible. There are beautiful pictures more than 50 feet from the car and the right tools can help you deal with age, couch or medical related handicaps. An SUV or a van and a couple of Labrador Retriever walking trainers can help.