Three other concerns regarding a "wagon".
1] The rear side windows often rust at their bottom edge. To check: remove the rear access panels and peel up the rubber moulding.
2] Self leveling [rear only] To check: Eng off, load about 300 lbs in rear. When engine is turned on, the rear should rise to unloaded weight.
3] Rear Seat Back release. To check: Remove head restraint. Raise rear seat cushion [pivots back to front], pull top of seat back forward and down so it rests on the 2 pins of the seat cushion. Pulling up on the red handle at bottom of seat cushion releases it. These pins are often broken or the seat cushion brackets are bent.

There are many posts on these three.

Bob
PS Wagon has cargo area of 6' with seat cushion folded and 6" more with cushion removed.