The Nuna Pipa Lite RX goes on the BOB Wayfinder with the BOB Wayfinder universal car seat adapter (model S14664700), about $59.99. With the carrier on, you are pushing about 38 lb (31.1 lb stroller, 6.9 lb carrier). The seat itself is rated up to 32 lb and up to 32 in, per Nuna.
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4 other infant seats fit the BOB Wayfinder.
Summary from the makers' published data.
How to set up the Nuna Pipa Lite RX on the BOB Wayfinder
What you need
The BOB Wayfinder
The Nuna Pipa Lite RX carrier (its car base stays in the car)
The BOB Wayfinder universal car seat adapter (model S14664700)
Step by step
1Set the parking brake, rotate the canopy toward the handlebar and recline the stroller seat.
2Find the R and L marks on the two adapters; the release button faces the outside of the stroller.
3Pull the fabric beside the frame back to find the yellow locking pins.
4Slide each adapter onto the pins, push down and squeeze the gray buttons until it clicks, then pull each one to check it is locked.
5Line up the car seat with the two adapters and push down until both sides click.
6Pull up on both sides of the car seat to check it is attached.