Equipment in Van for additional services

Just curious how the people that are offering additional services outside of standard carpet/upholstery are fitting all of the equipment in their vans. Are you carrying all of the equipment all of the time (i.e. tile/grout machine, duct cleaning equipment, window washing, etc), or do you have it in your van only when you have those specific jobs that day? We have full sized vans and would like to add the duct cleaning to our services, but that is a lot of equipment to add to an already full van, and we don’t carry our tile equipment with us unless we are doing it that day. Can’t offer it as an add on if you don’t have it with you, but likewise the vans can only hold so much equipment and still stay efficient in getting out what you need for each job. Can’t be unpacking and repacking excess equipment on every job to get to what you need. Just looking for thoughts/opinions outside of having vans dedicated to each service, which is the easiest way in the van dept, but does not allow for easy adding on of additional services at the job (pre-selling obviously helps in this dept, but that may lead to customer wanting it when they said they didn’t on the phone and now you don’t have the equipment).