This is where you can set your alerts for job type (Urgent/Non-Urgent etc) and vehicle type (Small Van/LWB etc).
It will also make the Newsfeed give you only the stuff you want. I.e. If you don't want to see for example Non-Urgent courier work, de-select that in the Alerts Settings above, and the Newsfeed (and your Alerts) will not give you Non-Urgent work.
Totally separate from that is what service types you offer, and which appear on your Profile.
This link allows you to select the service types you offer. Vendors are always asking us to ask people to show only the vehicles they actually have.
i.e. if you have an LWB, it may be true that's you're happy to do the odd small van job in it if you're quiet, but please don't list Small Van. Just list what you have, i.e. LWB. Let the Vendor decide if he/she wants to call you. It's taken as read that smaller loads will fit.