My Mrs has a slx 18ft, it does for 90% of our work
I use a slx 22 ft
Sometimes we will be on the same house together, but mostly we work on different houses,depends if it compact or not.
If your Mrs is going to use the van mount ,and you the backpack,i would suggest either invest in a trolley system, or buy a trolley for your backpack to sit on,and attatch with bungee.
Also my Mrs always does the door knocking bit,as im just eager to get on to the next house myself