so I don't trust these people
At day's end, everyone is prone to making mistakes ... seen similar sorts of W&B screw ups over the years myself. The crew is the last line of defence so you need to be on the ball with this stuff and a bunch of other stuff as well.
Guess that's why the Commander doesn't drop the ball and keeps a useful level of suspicion from sign on to sign off ...
If you aren't comfortable - doesn't matter whether you turn out to be right or wrong - query it and get the other guy to walk you through until you are OK with what is being presented .. and don't sign off on it until you are satisfied that it is OK to do so.
Your company's system should incorporate one guy/group doing it .. and the crew checking things in a reasonably independent manner. Mistakes are made but they don't bite if they are detected and corrected.
doubt they will have time to re weigh a/c between flights
Not a consideration and not necessary. The required exercise is a standard paper warfare thing on the RWA/LDS.
Same for airstairs/oven/seats removal
Exactly .. and done the same way .. just the numbers change.
but I don't think the Captain accepted the aircraft after the walk-round
.. love it.