Of course you can,
Space really,
I have a volvo estate and can carry 10 containers, bucket, Pole, point ladder on roof
I do use wfp on all my leaded windows and on georgians that make a difference.
It means i can get about 3 houses per 25 ltrs on smaller houses nearly four.
I only seem to carry more on the days when i have the awkward houses
max i use in a day is 6 or seven but i chuck a couple of spares in.
so i carry say 8 at a time max
Bring on a van when i get enough houses