Trailer Box - The trailer box series from UWS is available in two sizes: TBV-34 and TBV-49. TBV-34 features a built-in welded aluminum support for a secure mounting on the lighter-weight straight tongues of boat and snowmobile trailers. TBV-49 is larger and designed for use with camping trailers, lawn maintenance and utility trailers. This box uses space not often used and helps balance your trailer for better tracking and towing. Lots of usable storage and lockable too!!