Long term solution to avoid damp floors in tent?

Question

I’m making a place out in the jungle, walking access only. Maybe pallets even though they are kind of heavy. Only what I can bring in on foot.

Answer 1

As you say bring in Pressure treated 6x6 beams and then 1x6  planks.  Mine were still good after 15 years.

On sunny days open the tent or raise the side curtains to allow for air drying.

Don't paint or cover treated lumber, as Toxic gases may concentrate.

Answer 2

There are waterproof ground sheets for tents. Google it.