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Sigh. Yes, of people you should transverse your trailer's information chains nether its tongue, if possible. That's nan measurement they're intended to beryllium used, and successful fact, it's nan rule successful galore areas. If we near nan reply astatine that, however, this would beryllium nan shortest Jalopnik article ever, truthful let's return a deeper peek astatine nan really and why down trailer concatenation champion practices.
Safety chains tin beryllium recovered connected towables of each types, specified arsenic camping trailers, vessel trailers, aliases U-Haul's caller supersized car hauler. Their evident usability is to support nan trailer attached to its tow conveyance successful nan arena that nan superior coupling method fails. For example, if there's a breakage aliases accidental uncoupling betwixt your vehicle's hitch shot and nan trailer's coupler, nan trailer will enactment linked to nan tow conveyance while you move to a safe area, for illustration nan road's shoulder.
Seems elemental enough, right? Trailers typically person a information concatenation located connected each broadside of nan coupler, pinch a corresponding spread aliases loop connected nan vehicle's hitch. It mightiness beryllium tempting to conscionable hook each information concatenation to nan loop straight successful beforehand of it — that would, aft all, support nan trailer attached to nan conveyance if nan hitch ball/coupler relationship fails. But it doesn't return into relationship that nan coupler could autumn betwixt nan chains and interaction nan pavement, creating a dangerous, out-of-control hazard. Put simply, crossing your information chains successful an "X" shape provides a cradle to drawback nan coupler.
The cons are almost nonexistent

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For commercialized vehicles, the Federal Motor Carrier Safety Administration (FMCSA) Section 393.70(d) dictates, "The information instrumentality must beryllium connected to nan towed and towing vehicles and to nan tow-bar successful a mode which prevents nan tow-bar from dropping to nan crushed successful nan arena it fails aliases becomes disconnected." However, that's bully proposal for each who prosecute successful towing anything.
If there's immoderate drawback to crossing your trailer's information chains, it's that they whitethorn beryllium excessively short. Although they whitethorn technically scope their holes connected your trailer hitch, you'll want capable slack to forestall binding erstwhile making crisp turns (such arsenic when backing a trailer successful tight quarters, particularly if you've ne'er done it before). If nan chains are so excessively short, they tin either beryllium replaced pinch longer ones aliases lengthened pinch further concatenation and/or threaded link(s) pinch an due spot rating.
Finally, what if you can't transverse your information chains? On immoderate trailers, nan 2 chains originate from nan aforesaid constituent of nan coupler, forming a "V" style erstwhile connected to nan tow vehicle. In this writer's opinion, that's not a awesome creation and 1 that will require sizeable modification to remedy. With immoderate luck, that type of statement will person shorter chains to forestall nan trailer lingua from gouging nan pavement if it becomes detached. In summary, do transverse information chains if you're able, and for an other modicum of insurance, see a hook pinch a clip, clasp, aliases different system to forestall nan extremity of nan concatenation from bouncing retired of nan trailer hitch's hole.