This answer is for the WonderFold W2 wagon, though one maker didn't say which version.
Key specs
Adapter
about $99.99
Weight with carrier
49.9 lb
Good to know before you click it on
W2 Original and W2 Original Target Exclusive owners must buy the 'W2 Elite/Luxe' adapter option.
Seat models from 2024 onward are not guaranteed; only pre-2024 seat models were tested.
Two UPPAbaby adapters can be fitted on W2 Elite/Luxe (non-Pro) models.
About this pair
The UPPAbaby Mesa (original) goes on the WonderFold W2 wagon with the WonderFold W2 wagon adapter for UPPAbaby seats (model W2CSA-UPB), about $99.99. With the carrier on, you are pushing about 49.9 lb (40 lb stroller, 9.9 lb carrier).
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14 other infant seats fit the WonderFold W2 wagon.
Summary from the makers' published data.
How to set up the UPPAbaby Mesa (original) on the WonderFold W2 wagon
What you need
The WonderFold W2 wagon
The UPPAbaby Mesa (original) carrier
The WonderFold W2 wagon adapter for UPPAbaby seats (model W2CSA-UPB)
Step by step
1Set the stroller wagon's brake and unbutton the wagon fabric on the side where the adapter goes.
2Put a mounting bracket on each side of the frame with the metal piece on the outside, lined up with each other.
3Close the clasps around the frame, screw them shut, then fold the fabric back over the brackets and button it.
4Screw the car seat supports onto the adapter.
5Set the adapter on the brackets, then lock it by putting the metal clip over the bracket and pushing the clamp in.
6For extra stability, lower the car seat handle, strap it to the wagon's bottom crossbar and pull the strap tight.
WonderFold says it needs an adapter (W2 wagon adapter for UPPAbaby seats), without saying which version.
“Compatibility Guide ... Only compatible with W Elite/Luxe/Pro Series, L Series, W2 Original Target Exclusive, and W2 Original ... UPPAbaby | Mesa, Mesa V2 | *Not compatible with Aria or Aria V2”