1) I, too, have generally had very good experience with Jayco in terms of dealer and manufacturer response. This is my 4th Jayco RV.
2) I had spider-web cracks on my HitchHiker fifthwheel and although I never followed through with this suggestion, I did think it was a good one (for what it is worth): contact one of the bathtub renew companies that makes old fiberglass bathtubs look new and see what the could do and what they would charge to "renew the end-cap".
Joe & Barb
2006 Granite Ridge 2900GS
2015 Montana High Country 345RL