Solo....the DOT inspection are a drag esp. for the folks that dont maintain their stuff....been inspected but never shut down....My perspective is to is to keep all as safe as I can! Not sure if these connectors are same...they're not cheap...and they actually are not like the old style crimp on connectors-they suck and perform exactly like you speak off. The connector that I am speaking to are crimp ons but when they are heated via a heat gun there is -or what appears to be- a moderate melting point plastic resine that melts and actually oozes to the end of the shrink wrap as it shrinks with the heat-making them h2o proof and stabilizes them....I also use a secondary jacket of shrink on with liquid tape at the end of the secondary jacket in "the bad locals"-For me this method have been running strong in severe duty applications...I stress severe...Use to solder and jacket with shrink on, liquid tape, and good quality outdoor electricians tape...even have tried rubber tape. The new is an improvement for me....performs the same or better and is way quicker. Rewired the boat trailer this way also and dont know yet over the long haul...as it has only been 3 years...but so far so good. Has been working excellent on the tandem 12,00 GCW dump trailer for 6-7 years which is more than I can say for the any of the vehicles that I have ever owned. One of the other things that I have done is to jacket wire bundles with spiral wrap or some other wrap that with stand up to the sand and road grit....rubber hose works good too as does EDPM rubber membrane(pond liner /roof membrane)....one can also by rubber jacketed strand wire in different strand counts....5,7, etc.....NAPA.From my perspective I always up the strand count....I might want to put a light in the boxes on the trailer for those dark nights....why not do it up front....Like DAD says if it is worth doing the first time it is worth doing the right way! For him that meant buy and plastic junction box and mounting it to the trailer tongue-for me that is some thing that would get tore off...to each their own. The dielectric grease is smart, I use it in direct bury situations with cable TV and those other cables that I am not suppose to splice! Works sweet! Do have any way of circumventing the ye old trailer plug connector and break away switch issues.....lubing them but I still have to replace them more often than I care to. Any pointers?