It's legal, but most people will not want to buy it.
Yes, it is legal for an individual to possess both a Texas driver's license and a Texas ID card.
Selling used mattresses requires a mattress vendor license. The licenses are limited in the state of Texas. Selling a used mattress without said license is punishable by a maximum sentence of 2 years in prison and a fine of ten thousand dollars.
It is generally legal to advertise a used mattress in a newspaper as long as you accurately represent the condition of the mattress and follow any local regulations that may apply, such as labeling requirements or restrictions on selling used bedding items.
Absolutely. As long as you don't represent the mattress as being new it is most certainly legal to sell a used mattress.
Yes...you can give them away with a bed but NOT sell just the mattress
Yes.
yes...
Yes, it can be put on craigslist. Craigslist allows posts of all legal goods and services, used or new.
yes
yep
yes
Yes. ATVs (or "quads") are legal in Texas.