I had one made by a company named Dash by Josie, they used to advertise in MotorHome Magazine. Don't know if they are still in business.
Most recently had one made from Shade Pro . Was at the FMCA convention in Indy a few years ago and they had a booth there, sent someone out to measure , got it within 2 weeks. Very good quality ,reasonable and still looks great .
2011 Newmar MADP 4344, Tow vehicle, 2017 Ford Edge Titanium, Roadmaster Night Hawk tow bar and base plates Member of FMCA,Newmar Kountry Club, Good Sams , KOA,RV.Net, and IRV2.