Virosol is so 3 years ago (thats when i found it) ... im onto the next thing now and its not Boshravies stuff
could you not use one of them folding ladders(folds down in to 4 sections)you could unfold three sections and the fourth on to the roof as they normally have very wide feet/stabilisers and would probably straddle the conny roof bars
boshravieWhat's that on your ladder, looks like a microlite, tried one but had to send it back wouln't fit my ladder; "same ladders as yours" nested ladder.Leeps thanks Gavin.