My trailer is 40 years old.....somewhere along the 10 year mark the OEM non-treated started developing soft spots. In all honesty, I don't remember if I diesel/oiled it along the way or not. Replaced with Home Depot treated and every once in awhile did the swab down with D/O thing....sits out in the weather. It's been so long now that the wood has gone into the "petrified" stage and is hard as nails.....won't accept my knife blade tip. Still have the replacement floor I put in and just last month brought a new to me tractor home weighing out at about 3500# or so and not a problem.
On which treated, what difference does it make with the treatment differences?