to the forum and sorry to hear about your cracked front endcap. On a unit that old it may be very difficult to find a replacement cap and even if you do, the expense may not justify the investment.
You may want to locate a fiberglass boat repair shop. They are skilled in repairing fiberglass and should be able to steer you in the right direction to get your RV back in tip top shape.
Look around the forum, you'll find a wealth of information that may help you. Ifyou use the search feature in the blue bar at the top of every forum webpage, it is much easier to zero in on things that interest you.