this is the near side wheel arch they rust from the inside out as its double skinned here.they rust as well where the wing meets the hinge panel it will make the door drop if severe.
this is the offside wheel arch near the indicator they rust here as well as its double skinned they will rust on either side.sometimes the rust will extend to the front crossmember look under the indicator and headlamp to see rust here.
the doors rust along the bottom edge some will be missing the underneath of the door or will have lots of filler.
the steps rust here sometimes the step rust wont be visable until you remove the plastic..look from underneath and you will see how bad it is.the plastic holds the wet from your feet when you get in and out.some builders vans may have concreate on the steps hidding the rust..
the cab on chassis cabs will rot along the rear edge and sometimes will rust on the chassis section its usually worst on the passenger side as people leave there coats under the passenger seat and it soaks up the wets and rots the chassis.remember if the cab is rotten along the rear it will fail MOT as the seatbelts are here.
the rail under the plastic under the wipers sometimes rots and the rain falls onto the air filter housing or drips onto the inner wing and battery.the acid from the battery then rots the wing (loverly)
if you are looking at a chassis cab check the rear light panel hasnt rotted out and about to fall off.the side to rot first is usually the offside.the condesation from the exhaust attacks the panel..
and if the van you are looking at has 2 controls on the heater its a petrol model..if it has 3 then it is probably a genuine diesal.(but it can be changed but most people dont bother.)
I will add more when i get time to photo a rusty E reg chassis cab i got down the farm...(almost broke its back)




also the rear hinges on up and over rear doors can also rot near the hinge
