I would think you would need several units in high hog population- very large area for many miles, with land owners that are willing to pay what you need. Here it would not pay. Most that can afford to pay buy their own. Especially since the night vision has gotten so popular.
It was different 15 years ago. Better methods now. Most have better equipment.
It probably takes two weeks to get the sounder to commit fully on average here if they aren,t bothered or disturbed, unless it is in late winter. They run with dogs also. If the neighbor ran off the hogs after the trap was just set. It would take some time to get them back or not at all. Same way if they were shot at just before or just after you started. Sometimes you find out after the fact. Having more units increases options to maintain a steady income. At 5000$ a pop it might pay if there were enough opportunity for years. If you are in south Alabama the hogs will move into the swamps in summer or around wet areas of agriculture making access more difficult. Most are not going to want you around during deer season.
The more units the more your other costs would be, such as labor and added trailers, maybe a truck. Especially if you got lucky in 3 pens on the same day. The door would need to fall the first night they all entered, regardless.
If you are trapping along something like the Tombigbee the area is there. You would just need to know opportunity. You might try getting 20 -25 contracts before you committed to them or the purchases, of units.
That way if they wanted your services your customers would help you get started so the contract would start. They would contact their neighbors and friends for you.
It gets hot in Alabama in summer.
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