Kimberly, you have landed on a forum specializing in all-molded fiberglass (egg-type) trailers. Mine, like many here, has curved fiberglass aircraft-style doors. Some of our members have experience with conventional trailers, and they may be along with some help. You might get a quicker response, though, on a general RV forum such as iRV2.com.
Best wishes! I had a 1972(?) 24' Holiday Rambler some years ago but didn't have any issues with the doors. Great trailer, but just a tad heavier than my 13' Scamp!