Trailer tongue structure

Wife and I will be doing a long (30+ day) travel adventure with the camper trailer this year, and I plan to upgrade our 12v system to a high-capacity LiFePO4 battery (or maybe two, if I can make a big enough b-box). To do this I need to fab a new battery box.

I'm trying to determine how much space I have to work with, and thus my question: are the welded-on angle iron pieces that the standard battery boxes sit on considered structural for the frame? If I can safely cut those off I can fit a good-sized box nestled down in the V. If I can't remove them without compromising the tongue strength, I'm much more limited on what I can do.

These are the pieces I'm talking about:

Do they add some structure, yes. Are they structural? Not really.

If you are going back with a box attached similarly you will be replacing what you remove for the most part and may actually end up stronger if the box you use is steel.

Yeah, those things are not adding much. If it were me, I would probably cut them out, figure out the dimensions of the box I want and replace those with 3/16 x 3" flat bar at points fore and aft of the box, oriented vertically. Then bolt the box between the flat bars.