Interpreting “popular” as in people want to be riding in it, for what it’s worth.
Is it a plane? (Official)
1 - (soyleche) Is it alive? No.
2 - (Tiffany) Is it related to actuarying in some fashion? No.
3 - (Kerfuffles) Is it edible? No.
4 - (soyleche) Is it man made? Yes.
5 - (John.S.Mill) Is it created in the last 100 years? Yes.
6 - (soyleche) Would a normal person be able to lift it off the ground? No.
7 - (BruteForce) Is it bigger than a breadbox? Yes.
8 - (Tiffany) Can a person get inside it? Yes.
9 - (soyleche) Does it spend at least 80% of its time in one place? Probably not, but maybe.
10 - (John.S.Mill) Is it an appliance? No.
11 - (soyleche) Is it a vehicle? Yes.
12 - (John.S.Mill) Would an average person consider buying it for everyday use? No.
13 - (soyleche) Is it a car? No.
14 - (bwg) Can at least one person walk upright in it? Yes.
15 - (John.S.Mill) Is it a boat/RV? No.
16 - (Kerfuffles) Is this vehicle popular to ride in cities? Not usually.
17 - (Tiffany) Is it a plane? No.
You know what, I’m going to throw you a bone and say that a boat is a form of recreational vehicle and the answer is that no, it’s not a boat, not an RV of any kind.
Unofficial:
I’m about down to a van (which can have problems with #14), a bus (which I think would be a solid “no” on #9, not a “maybe”), or a train (which has the same #9 issue). Maybe a pickup truck if you consider walking in the bed for #14.
If it helps, on #14, I interpreted the question to mean “inside the vehicle”.

a bus (which I think would be a solid “no” on #9, not a “maybe”)
Unofficial, unless it’s a school bus, which would fit with twig’s noted calculation being slightly less than 80%.
I like school bus
I think pickup truck would be a good guess
Is it usually a commercial vehicle?
1 - (soyleche) Is it alive? No.
2 - (Tiffany) Is it related to actuarying in some fashion? No.
3 - (Kerfuffles) Is it edible? No.
4 - (soyleche) Is it man made? Yes.
5 - (John.S.Mill) Is it created in the last 100 years? Yes.
6 - (soyleche) Would a normal person be able to lift it off the ground? No.
7 - (BruteForce) Is it bigger than a breadbox? Yes.
8 - (Tiffany) Can a person get inside it? Yes.
9 - (soyleche) Does it spend at least 80% of its time in one place? Probably not, but maybe.
10 - (John.S.Mill) Is it an appliance? No.
11 - (soyleche) Is it a vehicle? Yes.
12 - (John.S.Mill) Would an average person consider buying it for everyday use? No.
13 - (soyleche) Is it a car? No.
14 - (bwg) Can at least one person walk upright in it? Yes.
15 - (John.S.Mill) Is it a boat/RV? No.
16 - (Kerfuffles) Is this vehicle popular to ride in cities? Not usually.
17 - (Tiffany) Is it a plane? No.
18 - (John.S.Mill) Is it usually a commercial vehicle? No.
Is it an emergency vehicle?
1 - (soyleche) Is it alive? No.
2 - (Tiffany) Is it related to actuarying in some fashion? No.
3 - (Kerfluffles) Is it edible? No.
4 - (soyleche) Is it man made? Yes.
5 - (John.S.Mill) Is it created in the last 100 years? Yes.
6 - (soyleche) Would a normal person be able to lift it off the ground? No.
7 - (BruteForce) Is it bigger than a breadbox? Yes.
8 - (Tiffany) Can a person get inside it? Yes.
9 - (soyleche) Does it spend at least 80% of its time in one place? Probably not, but maybe.
10 - (John.S.Mill) Is it an appliance? No.
11 - (soyleche) Is it a vehicle? Yes.
12 - (John.S.Mill) Would an average person consider buying it for everyday use? No.
13 - (soyleche) Is it a car? No.
14 - (bwg) Can at least one person walk upright in it? Yes.
15 - (John.S.Mill) Is it a boat/RV? No.
16 - (Kerfluffles) Is this vehicle popular to ride in cities? Not usually.
17 - (Tiffany) Is it a plane? No.
18 - (John.S.Mill) Is it usually a commercial vehicle? No.
19 - (Kerfluffles) Is it an emergency vehicle? No.
I’ll just point out that y’all only have one question left, so it ought to be a guess.
Not it.
Ugh… my guess of fire truck and ambulance are gone now.
I think school bus is out with #18. I think all we have left is alien space ship.

my guess of fire truck and ambulance are gone now.
wouldn 't those be ruled out by 18?
truck would be my best guess, if twig doesn’t need anything more specific beyond that. pickup truck would make sense too.
maybe a jeep too.
A given pair of pajamas gets used more than a given condom, but still not daily. They’ll go in the wash. In most climates they’ll be out of season for a bit.
I feel like it would be flat out wrong to say that a pajama top gets daily use, and it would certainly be inaccurate to claim that a condom gets daily use.
Really? If you asked me if i wore my pajamas tops every day I’d say “yes”. I do usually use the same pair of PJs for a full laundry cycle.
Eta: oops, I’m WAY behind. Never mind.
I wonder if twig was thinking of small children when answering the question about at least one person standing up.