Elderly Central offers a range of Combination Wheelchairs. The Rollator/Wheelchair combo units can all be switched quick and easily to be used as either a transport chair or rolling walker for independent use. Combination Rollator Transport Chairs, also known as companion wheelchairs, have four small wheels instead of two small and two large. A transport chair is designed to only be pushed by a caregiver, also known as a 'rollator transport chair'.Order via the web or give us a call at +1 650 488 5557 - we are here to help. See our lightweightcombinationwheelchairs and folding power wheelchairs. Free Shipping. Order via the web or give us a call at +1 650 488 5557 - we are here to help.