Just looked at the John Deere website for the TX and under spec's it lists a 19 hp v-twin it also lists it in the comparison section. However the first page on the TX still lists the 13 hp engine. Same top speed (20 mph) and the same towing weight. Not to sure about having plastic in the bed. I have had a lot of bricks, wood and junk in my steel TX bed and I do not think that I would want any plastic in my bed, just my thoughts. Still the 19hp would be nice, but I think you would want 4 wheel drive to use that extra power.