A folding mobility aid, such as a wheelchair or a folding scooter, is usually fitted to a car after the fact. The aid is already in the house, the car is already in the drive, and the open question is whether the two meet at the rear hatch or the side door. This piece gives a household a short set of measurements and questions to settle before the first trip, so the fit is known in advance rather than found in a parking lot.
Measure the folded aid, not the box it came in
Take the folded length, width, and height of the aid with any removable parts off, such as a basket, a seat cushion, or a detachable battery pack. Write each figure in the same unit the vehicle's owner's manual uses. Note which part is heaviest, and whether the aid folds flat or has to stand on end. An aid that looks compact in a showroom may still be taller than the cargo space once the battery or the armrests are included.
Measure the opening and the load floor
Measure the hatch or door opening at its narrowest point, not at the top where the glass or the lid is widest. Then measure the height of the load floor above the ground. A lift-over is a different task from a slide-in, and a high sill means the aid must be lifted, which means the person doing the lifting has to be able to do it without strain. Check whether the rear seats fold to add length, and whether the folding changes the usable floor.
Trace the lift path
Stand at the opening and trace the route the aid will take from the ground to its resting place. Look for the parts that catch: a rear bumper edge, a roof rail, a hatch that stops partway, a door frame, or a cargo cover that has to come off first. An aid that fits when flat may still be blocked when it has to tilt to clear the opening. Ask whether it can be loaded from the side instead, and whether the passenger door opens wide enough to make that workable.
Secure it before the car moves
Decide where the aid will be fixed for the trip. Look for tie-down points, a cargo net, or the seatback anchors, and check that the anchor you choose is meant for the weight of the aid. The owner's manual is the place to confirm what the cargo area is designed to hold. Do not rely on a loose strap to hold a heavy item when the car brakes.
Questions to settle in the household
Who lifts the aid, and how often? Who unfolds it at the destination? Does the car have more than one regular driver, so that each person knows the loading routine? Is there a second route, such as a larger vehicle or a curbside drop, for the days when the usual car will not take the load? Write the answers beside the measurements so the household has one page to check when a trip changes.
Keep the record and measure again
When the aid, the car, or the loading routine changes, measure again. A new cushion, a different frame, a new folding pattern, or a change of vehicle can each shift the fit. Keep the measurement sheet with the owner's manual and any service record for the vehicle, so the figures stay together when someone new needs them.