[Closed] Trailer friendly route nr Marshbrook

Heading top the Marshbrook CRC event this weekend - wife will do the mtb ride Sat, I will do the road ride Sunday. I am going to chuck the bike trailer in and the cross bike and head out for a bit with the sprog on Saturday. So looking for an on road/off road route - very quiet, can manage bridleways etc but clearly nothing too rocky or technical. Any suggestions? probably 20-25km max.
If anyone has a gps route uploaded I could "borrow" or can point me to where I can find such that would be great.