30 plus yrs ago I worked with a bunch of guys ( NJ Piney’s) who regularly roasted pigs they stole from local farmers.
They had a big slow turning rotisserie with an electric motor that used a fan belt to turn the pig. They called it a spit.
They dug a hole about a foot deep and would fill it with wood and start the burn around 4pm. By 10 pm, a trash can was filled with empty cheap beer cans and the hole was filled with a foot thick bed of hot coals. They then dragged the spit with the pig chicken wired to it over the hot coals and as it spinned all night and we continued to drink.
We picked up a few winks in the wee morning hrs and by noon when the tip of a knife blade inserted to the femur bone was hot to the touch it was done.
Later in the day they filled another hole with water and the mud wrestling was under way. Sunday morning eventually arrived and you called somebody to come get you. Once home you slept until Mon morning.
May be able to rent a spit and not have to deal with all the cinderblocks and such.