Boatbuilders hat on now! Woods suitable & not for jobs like this.
Keruing, hard wearing & durable, pinky red colour, prone to splintering, if you get splinters from this they always go septic.
IPE a south american hardwood often sold as decking, its hard & strong & a pleasant deep golden brown colour also highly durable.
Iroko is Ok but durability exposed to fresh water wont be brilliant.
Ash, classed as non durable & will rot as soon as it smells rain!
Oak, full of tannic acid which will eat your steel.
Elm, durable but very hard to get, does not like being wet & dry & will rot. It also warps all over the place.
Cedar is rot proof but too soft & will get damaged.
Pitch pine, If you can find some this was used in shipbuilding & construction & is lovely stuff if you can find old stuff.
Jarrah, An australian hardwood that is a deep red. can be worked with carbide tipped tools but otherwise hard going.
Teak is lovely but overkill for a truck bed, It has reached such a huge price that it really isnt economical to use it for a job like this.
For what its worth & ease of obtaining it i would go for Ipe decking.
Keruing, hard wearing & durable, pinky red colour, prone to splintering, if you get splinters from this they always go septic.
IPE a south american hardwood often sold as decking, its hard & strong & a pleasant deep golden brown colour also highly durable.
Iroko is Ok but durability exposed to fresh water wont be brilliant.
Ash, classed as non durable & will rot as soon as it smells rain!
Oak, full of tannic acid which will eat your steel.
Elm, durable but very hard to get, does not like being wet & dry & will rot. It also warps all over the place.
Cedar is rot proof but too soft & will get damaged.
Pitch pine, If you can find some this was used in shipbuilding & construction & is lovely stuff if you can find old stuff.
Jarrah, An australian hardwood that is a deep red. can be worked with carbide tipped tools but otherwise hard going.
Teak is lovely but overkill for a truck bed, It has reached such a huge price that it really isnt economical to use it for a job like this.
For what its worth & ease of obtaining it i would go for Ipe decking.