Yep I play Eupho, Marching Baritone, Marching French, Marching Trom, Slide Trom with F, and I was playing Bass Trumpet when I was a kid (mid 20s). Reading Concert and transposing is not a problem, it is only a transposition for Bb so easy. Happy to transpose for Eb etc as well. My problem is I play for Jazz or to add a depth where only trumpet would get boring. I have not played Bass Clef for reading so if given Bass Clef music to play for Trom I am stuffed, give me piano of Sop Sax, or Tenor Sax or Trumpet, Bb C, then not issues. Just an octave below what is written.
I am happy to play Tenor Sax, and Soprano Sax and Clarinet as well, all related to the Bb and reading in the Treble Clef. I dabble with Flute (C). I am too lazy to bother to get really educated for Bass Clef, when I can double by reading off the trumpet part, or the Piano part and transpose. I have zero problems transposing off the piano Treble Clef parts either. I also have a little go at C, D, Eb and Picc trumpets, Flugel and Cornet. I enjoy it too much as an amatuer (a-mature) player to get wound up worrying over the Bass Clef. I only came back to playing in around 2003, after 25 years away from music, but used to be OK when I was in my teens to 20s and Thank God got through life to find my chops are still there and no injury.
Tuba - well I have a huge respect for Tuba players, after trying to play one. I could get a nice sound, but could not get down low enough - really, really difficult.
So I know I cannot read Bass Clef, and cannot bother to learn it at this stage, when I can do what I need to do from Treble Clef.
Next instrument - Scottish Bagpipes!!