Don't be too surprised if the shower trap cracks again.. Mine was cracked after it's first trip out back in 2002. Took it to the dealer to fix and they fixed it right up. Next trip out, I see water dripping from the back corner of the trailer again.. Look and sure enough, the trap was cracked again.
Well, I just went to the local hardware store and picked up a rubber collar with different size openings to fit over the trap. After cutting off the cracked part, I simply slipped one rubber end to the drain on the shower and the other end to what was left of the trap.
That was 11 years ago and not a problem since. :)
I figure it was whatever flex occurs at the back of the trailer while traveling, because I don't actually use the shower to shower in.. It does share the same drain from the kitchen sink, so that's why it would leak before..
Good luck!
Mitch