I guess I never posted the more recent cargo solutions I've been using, icnluding a couple new trailers and a trike.
The SB Cruiser trike
https://endless-sphere.com/forums/viewt ... =2&t=67833
is the most useful, especially since I rebuilt it to have a cargo box to sit on instead of boxes mounted to either side under the seat (as CrazyBike2 had). It's changed a bit since the pic below, but not enough to negate the info in the pic
So now it has around 3+ cubic feet of space in a lockable insulated box that's structurally part of the trike. (about a third of that is used for a toolbag and the 2kwh+ battery ATM, but that will eventually go under the trike in a thin "pan" to free up the cargo space). The pic below was before rearranging it so the battery is "flat" on the bottom of that side of teh seatbox
with the toolbag and stuff on top of it, instead of in front of it (easier to get stuff in and out).
Then there's teh cargo bed, which can be used as a flatbed deck,
or can hold a dog kennel like the Mk I flatbed trailer did here
https://endless-sphere.com/forums/viewt ... 83#p675818
and the kennel can contain an entire mounded-over large grocery cart full of stuff, inside styrofoam coolers to both contain it and keep it at temperature (cold or hot) and dry regardless of the weather. Then there's the rack on top of that, which can hold a few more coolers full of stuff (or just items themselves) strapped down.
The rack is removable, but it takes teh canopy with it, so I generally don't remove it, as it also holds the lighting bar up higher (it can be bolted down at the back edge of the deck when the rack isn't on there). I can also bolt a suitcase to the top of the rack, which adds more lockable weatherproof cargo space (with thin insulation against the heat)
It can also pull the Mk IV flatbed trailer, which has hauled almost 500lbs of dog food on it,
some largish furniture (heavy cabinet), pallets, metal shelving, etc., and of course it's designed use--hauling Yogi (150lbs):
It's got 26" wheels; I'd use smooth tread tires if I had any for it, but hte knobbies were pretty new and free, so I use them
Kirin (120lbs) is riding in the kennel on the trike itself.
The Mk IV trailer
https://endless-sphere.com/forums/viewt ... it=trailer
(like the Mk III which is narrower, a little less width than the trike, comparison pic here during construction of Mk IV )
uses an automotive ball hitch, because I had it, and because I knew it wouldn't break under the loads I'll pull with it (I've had problems with "normal" bike hitches in the past because I'm generally overloading them from their design intent).
Crazybike2 also has a ball hitch mount on it
so both it and the trike can be used to pull the Mk III or IV trailers.
The main thing that's different about the Mk IV traielr isn't so much it's size, but that the deck is slung below the axles, so I can use large diameter wheels for better ride quality and easier pulling over bumps/holes/curbs/etc while loaded (much harder to do the smaller the wheels are), but still having a low deck for COG reasons. I've considered going back and altering the Mk III trailer to be like this too, but haven't had a need for a narrow version so just haven't done that. When hauling stuff on the roads Iv'e found that wider and bigger makes cars/etc go all the way around me in the other lanes, rather than trying to zip past me in mine, so it's safer this way, too. I try not to be in anyone's way, or in high-speed / high-traffic areas, but there aren't always alternate paths or back streets to use, so sometimes I have to be on main roads, and smaller is not better there.
Also, smaller wheels get beat up faster than bigger ones, with these kinds of loads. At least, I've had more problems iwth smaller wheels than larger ones, so far, and I've put a lot heavier loads on teh larger wheels than I ever did on the smaller ones.
I started down the path of slung-deck in the Mk III here
https://endless-sphere.com/forums/viewt ... er#p954767
but I didn't go anwyhere near far enough at the time.
I've built a number of trailers over the years, and some of htem never even saw actual use before being dismantled and/or rebuilt into a different design, simply because a neighborhood test run proved problematic in some major way. The main ones that have been useful were the "chariot" trailer in the DayGlo Avenger images earlier in this thread, and the four flatbed trailers, to varying degrees. Three of those were custom built, and Mk II
https://endless-sphere.com/forums/viewt ... it=trailer
was just a rebuild of a Bell type kid's trailer, which while useful had the most problematic hitch.
The elastomer and spring just weren't up to the surges of accelration and braking, while also pulling 100+lbs of Tiny:
https://endless-sphere.com/forums/viewt ... =2&t=18671
was a decent hitch but too high up, and I didn't really ahve the right hardware to bolt it together with, so I always had little (and twice quite large) issues with it. Nowadays I can think of a lot better ways to build that hitch (made from bike stems and a fork and some steerer/headtube pieces and bearings, and some bolts/nuts/washers), but if I were to use somehting other than the automotive ball hitch, I'd use a pintle type instead. Is mechanically simple, and can be quite tough.
At present the Mk IV is teh only one I've used since building it, whenever that was, and with teh trike's cargo capability, I don't need it that often, except when taking the dogs places (since only one fits on teh trike so the other has to ride int eh trailer), and when hauling things that won't physically fit on the trike.
All my trailers have turn signals, tail and brake lights, and I've used the same connector type for the whole time I've been buildng trailers and lights; the old 5-pin DIN used on AT style keyboards and MIDI connectors:
I started out using htem beause it's what I had, and because coily extensions for this connecotr were easy to find at any computer store (nowadays not so much
), and they generally stay plugged in pretty well. I don't need high current as I use LED lighting whereever possible, like here where I replaced the incandescetns in these MC lights with 12v aquarium "spots", which make them at least as visible in daylight as the originals:
The actual lighting bar on teh back of Mk III and Mk IV is removable, so it can be tied down to the load itself if it's longer than the trailer, or moved from one trailer to the other, etc., though originally I just ziptied the lights to the dog kennel
but it didnt' take long to move them to teh bar they've been on since:
cuz if you're lit up people are much more likely to see you and not squish you