Leaks are real hard to know where they are really leaking from until you dig into a repair. It coulld be leaking from that spot but, check above it clear to the roof and look for water signs. Remember water runs down, look up from where you think it's leaking, it might be highter. Tell us what trailer it is, may be a known problem of that model.
2013 24RKSWE (27ft TT) Cougar 1/2 ton series
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed 3.55 rear end lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.