Yes the deciding factor for the 19 is the permanent bed. (previous choice on the 17 would've been the 17A) coming from a utility style trailer anything has more space anyway
It's funny the overall length was discussed... I guess I was not aware of how the trailer length was measured conventionally. Our custom trailer sits at 14-15' overall length so a couple feet more is not too hard to decide. The additional axle going from 17 to 19 took a little longer to ponder tho (but in the end the queen size bed wins anyway).