Hi, I had one fitted to the bus by PWS when they fitted the tow bar, the dirt skirt came from SDG in South Wales it works well keeping road mess off the bikes I carry on my Thule bike rack which has got an underskirt fitted.
Yes, will help stop stones hitting the toad.. but won't completely eliminate the spray so it will still need a wash after towing in foul weather.. so IMO of limited value.. more help to following vehicles..
Always reminds us of the underarms of German ladies you see on the beach, I should probably get one for the Burstner then
Recently fitted some of those "bristly" mud flaps to the back of ours and panelled in the rear bumper with some pvc cladding I had around, keeps the crud off the rear lights and wiring, got the idea off here too, Techno maybe ? thanks anyway !