Some kind of door or gate? No

Did it originate in Eriador?

Is it portable?

Did it originate in Eriador? Yes
Is it portable? Not really

Random guess . . .
 

The firewood the Fellowship carried up Caradhras?

Third Age ?

Was it used before the hobbits got to Rivendell?

The firewood the Fellowship carried up Caradhras? Nope
Third Age ? Yes - Again
Was it used before the hobbits got to Rivendell? Sure was

It is firewood in general?

It is firewood in general? Nope

Was it used before they got to Bree?

Was it used before they got to Bree? No

The firewood they found on Weathertop?

Was it used in Bree?

The firewood they found on Weathertop? No
Was it used in Bree? Yes

was it a piece of furniture in the pranching pony?

was it a piece of furniture in the pranching pony? No

something found inside the pranching pony?

Something found inside a bedroom in Bree?

something found inside the pranching pony? No
Something found inside a bedroom in Bree? Nope

Was it the wooden sign above the frontdoor of the pranching pony?

Was it the gate that led into Bree?

Was it the paper with the
message Gandalf left for Frodo?

We have a winner...
 

Well done, Telchar!

I got one ...
 

Hit me ... ;)

*Punches*
 

Third Age?

Ouch !!!
 

Third Age: YES

"It's alive!"

(Or is it?)

not alive!

Is it something tangible?

Is it something man- (dwarf, ent, elf, orc, hobbit, etc.) made?

*kicks*
 

something valuable?

Is it something tangible? No
Is it something man- (dwarf, ent, elf, orc, hobbit, etc.) made? No
Something valuable? No

Is it a song or poem?

Is it an event?

Is it a song or poem? No
Is it an event? No ... not really

Correction:
Is it something tangible? No ... yes, no, its both ;)

Does it have a connection to a vala or a maia?

Does it have a connection to a vala or a maia? Nope Can't say that is does

Is it something nature related?

Is it something nature related? No, not specificly