First Build 7x16 v-nose

Hi Everyone, I'm in the process of ordering up a trailer from Trailer Showroom and I've got a few questions:
1. Is it okay to use pressure treated wood for the floor in a camper conversion? It seems like a good idea after seeing so many travel trailers with rotten floors.
2. What about tongue length? They offer a longer tongue. Is there an advantage to that type of option.
Thanks for the opinions/advice
1. Is it okay to use pressure treated wood for the floor in a camper conversion? It seems like a good idea after seeing so many travel trailers with rotten floors.
2. What about tongue length? They offer a longer tongue. Is there an advantage to that type of option.
Thanks for the opinions/advice