Just found out the floor in my big 2 horse trailer is rotting on the side I always haul my horse on and I need to replace. I this going to be a royal PIA and I should have someone else do it?
If you are comfortable with basic carpentry it isn’t a hard job, not fun though. A fair bit of swearing can end up happening, it depends on the bolts…
The really, really important thing is getting the correct wood. You want White Oak/Red Oak, in the trade often called rough oak as it is not planed smooth. Second choice is Douglas Fir or Southern Yellow Pine, both are more available, more easily installed, but not as strong.
A luxury option are the tropical hardwoods…I’ve never worked with them, supposedly very nice.
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I replaced mine by myself last year. It was boring but easy. All I needed was a grinder to cut the old screws & sand the frame, primer to repaint the metal, & impact driver for the new screws.
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I’m a Handywoman Weenie 
So when I bought a wood-floored trailer where the wood in the nose was rotted, I had the guy who services my trailer put in a whole new floor.
For 16’ stock trailer, I bought 20’ treated 4X6 boards. IIRC, lumber cost ~$300.
That was 5yrs ago, floor is still in great shape.
I’ve never had to do it, my Logan had a wood floor but we lived in AZ for most of its life so it stayed very dry.
Here’s a data point for what to use for replacement
Trails West uses high quality 2”x10” douglas fir lumber for the horse/stock compartment floor. This proven design has remained unchanged for the last 29 years
If you can get rough cut white oak that is the gold standard, but it will be expensive!
Yeah, I’m also out west and think Douglas fir is pretty standard. Several years ago I had just the back portion of my Logan slant replaced at the local trailer place and it was like $200 all in. I’m sure it would be more now, but much of that would be materials. IMO, worth it to just pay someone who is well versed in getting it done right.
Here’s my question. This is treated, right?
I paid to have it professionally done on my previous trailer. I believe they used oak and coated it with marine grade epoxy.
It held up well and was in excellent shape when I sold the trailer a few years later.
My DIY skills are pretty basic and it wasn’t something I felt comfortable taking on myself.
