1. I would not use synthetic lumber. I don't
believe that they are strong enough, especially with impact. I could be
wrong though, check web siles and trailer manufacturers and you may find that
some is. I'll guess that really strong synthetic boards are a bit more in
price. They also may need supports closer together than wood.
2. It is possible that the rot is confined, but I
doubt it. Take a screw driver and poke and hit the floor near the sides
and board ends etc. looking for rotten spots. You most likely will find
some.
3. I have used treated tongue and groove 2x6's with
good effect to replace trailer floors. The first one I did was fine 15
years later when I sold the unit. If you live in the right area of the
country, oak boards may be available locally at a reasonable price.
4. If you rip the floor out, you will probably find
that there is rust on the steel under the boards. Wire brush, power brush,
or sand to get as much as you can get off. 3M sells wheels that fit on
drills that work great for this. (sorry, even though I worked on the
product 20 years ago I can't remember the name.) When you have the rust
off, brush prime and brush paint with rusty metal paint. The extra work is
well worth it.
The wood is not that spendy, and the craftsmanship
required is not that great. Just follow whatever was done by the
OEM.
Ed
Ed & Wendy Hauser 2994 Mittower
Road Victor, MT 59875
