Looks like you are getting the hang of it. I usually charge $800 to tear down a trailer. Our county will not issue a moving permit for any trailer built before 78, we have like 1500 of them (most occupied) so tear downs come around often. The labor is horrendous any way you look at it. I have torn down entire parks and here is my method with a 3 person crew. 1-empty them out,furniture,cabinets,carpet (if possible),paneling 2-remove windows (bust glass in dumpster..safety,safety) 3-skin aluminum sheets (or galvanized on older trailers) 4-remove insulation (fold and stack,or stuff in large lawn/leaf bags) and put it on CL for sale,cheap..it will sell.Harvest wiring 5-cripple the shell by removing 2" by 3" studs (or 2' by 4" if you are lucky)..knock them out with short 3lb sledge,bundle and sell on CL for cheap,again they will sell. 6-knock over, once it is wobbly 3 people can push it over 7-Harvest roof metal and trusses 8-cut decking and sell 9-chop up frame.3 day job!!