A treatment system for the surface treatment of workpieces, particularly vehicle bodies, includes a plurality of transport devices, on which at least one workpiece to be treated can be attached in a releasable manner. A thin structure is incorporated in the heat exchanger tube and has a substantially rectangular channel-shaped waveform in cross section. The steering device comprising a sensor means mounted on the main frame of the towed implement for sensing a misalignment of the towed implement and the work vehicle and producing a signal corresponding to the misalignment. Damaged sockets are easily replaced with minimal disruption to the surrounding soil by backing the helical anchor out of the ground only so far as necessary to detach and replace the damaged socket, and then reinserting the helical anchor in the same location. The outboard motor can include various exhaust passages and features for controlling and discharging the flow to and from the catalyst device. The user can then send the selected image to one or more other users or to aggregator servers in order to communicate emotions or to tag or rate various things with emotional significance, so that quantitative statistics on emotional significance can be computed for those things.