Not a folding top, but...
As a DIY project, we 'repurposed' a hard plastic, translucent cutting board to be a stove cover, hot pad, cutting board, and splatter guard.
We added three wine bottle corks (cut to ~1/3 length) to serve as legs. They are spaced to fit between the TT stove grates to hold the board in place when traveling. When cooking, the board leans up against the back wall to be a splatter guard.
Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18
2006 Ford F350 PSD, 4WD, CC, LB, SRW, Cmpr. pkg, Equal-i-zer 4-p, Continental ContiTrac TR