Diesel exhaust

Have Ford F-350 diesel, wonder if anyone knows source for downturn exhaust tip and if it would help prevent exhaust fumes from settling on front of fiver when traveling in rain.
Diesel exhaust

Bought one from Camping World for my F-350 PSD dually, never had the exhaust problem with the fiver but did have soot on my rear fender above the pipe. I bought a chrome tip which looks pretty sharp - had to hacksaw off several inches of the tail pipe but it was not a difficult job. I think my mud flap keeps the exhaust off the trailer.

'98 Kountry Star 5th wheel
'99 F350 Lariat PSD dually