The photo shows a person using an Advantage-Rail by HealthCraft for a transfer. It can be mounted to the floor in any room and also used as a portable grab bar in multiple rooms by setting up floor mounts where needed. Here you see it in a bathroom. It could be next to a tub if that would be more convenient. The arm swings from side to side and locks to a position convenient for users who want to use it to help them sit, stand or transfer.

Healthcraft says, "The rail pivots to move with you in safe small steps providing moving support similar to a walker, yet it can lock in an instant in case of a loss of balance, need for rest, or to assist to a seated position." See the Advantage rail and get contact information from the Helathcraft website.

Note the raised toilet seat with arms on the commode. It's light weight and simple to move so it can be put on and removed as needed. It is available from any Invacare dealer. See it here Raised Toilet Seat with Arms