It is kind of hard to make suggestions not knowing exactly what new FW you are purchasing. If it has 6-point level up then there are some wheel chock options you may not want, in other words the simple ones work best.
If you have a TT already then I am not sure what else you would need that would be different going to a FW.
Two things we did not let our new FW leave the dealer lot without was built in electrical protection and upgraded tires.
Many new FW models come with cheap tires that are barely rated for the empty weight of the trailer. Many new owners discover after loading 2,000 pounds of supplier and gear to their FW they start blowing these new tires.
These are two options you could ask the dealer about but they are probably not what he is considering assessories.
