(below is crossposted between the SB Cruiser thread and the Mk IV trailer thread)
Heaviest load so far, I think, at 591lbs of dog food.
The trailer carried most of it, 468.5lbs, while I only put 122.5lbs of it in the trike's bed.
The trike carried 3 bags of food, plus 50lbs of cans (whcih I use a spoonful of plus some water along with a hair under two cups of dry kibble for each of their meals, twice a day for each of two dogs; makes their meals more enjoyable. They'll eat anything, but they go for it more enthusiastically with the wet food in there).
FWIW, each bag of food averages about 1.5 to 2 weeks of food, so this trip gives me around half a year of food. At the extreme clearance prices I got it all at, it was only $250 for all of it (I think the receipt said I saved over a thousand dollars, and that doesn't include all the savings!). I couldn't readily feed these monsters at regular prices (at least, not anything even halfway decent, and almost all this stuff is pretty good).
The trailer wiggled a little under this load in turns and on the washboard sections of road at intersections and whatnot, but nothing broke or shifted around. It also balanced just fine, and I had no problems with it pushing the trike around or causing any handling problems.
The trailer tires, inflated to 50psi just before I left the house to go get it, were still squished quite far by the load (which they aren't designed to take, of course), but not enough to be damaged visibly by the end of the ride home, and when checked after unlaoding didn't appear to have leaked.
It did temporarily deform the bed into a slight curve, and canted the tops of the wheels toward each other--not unexpected. Didn't interfere with the load or rub on anything except for the top edge of one bag on the right side that looks like it touched the tire at some point--probably in a right turn.
Once unloaded it appears to be flat again, as normal. If it was built out of "real" steel tubing, rather than old retail signage, it'd probably be stiff enough to not have this problem (and might even weigh less). Alternately if I had a rail around the whole thing, that would also stiffen it up. That was part of the original design plan (to be removable for flatbed use), but like brakes has not been implemented yet.
Speaking of weight, I'm not sure I ever actually measured the trailer's dry weight, which turns out to be about 75lbs, holding it vertically standing on it's nose on a scale. Heavier than I thought, but lighter than it could be. This includes the deck and frame and wheels and hitch and lightbar on the back.
I bolted the SMV sign to the vertical of the lightbar. Usually this sign is bolted to teh tailgate of the trike, or if I have the dog kennel on the trike, it's bolted to the door of the kennel. Whatever the rearmost largest vertical surface is, that's where I try to put it for visibility.
I actually had only a couple of drivers get a bit testy as they went around me, gunning their engines to accelerate as fast as they could--but both of them did so in areas where there was no other traffic but them and me, and they had the complete left lane clear to pass me in. One used that, but the other came close enough to almost hit the trailer's left edge with their tires, and their door mirror overlapped the space the trailer took up.
Nobody honked or yelled, and everybody else just went around me normally, most of them switching lanes well before they got to me, which surprised me because most don't seem to think of that until they get right up behind me.
Was also surprising because I was going around 15-16MPH most of the way home, as braking from 20MPH with this load takes quite a long distance (still haven't built brakes into the trailer--I really need to do that
). Braking from 15MPh is less than half the distance.
As I was approaching home, about half a mile away, a police car followed me, pacing me at a distance of several car lengths behind for around 1/4 mile, but then they turned off into a different neighborhood. Probably they were just curious as to what the heck this contraption was.
Trip stats below. Note that stats are comparable to teh trip with just Kirin (only about 140lbs load on the trike, no trailer), though load was same on trip there and trip home with Kirin, and here it was just the trailer's 75lbs on the way there, plus 591lbs more on the way back.
Speeds were same boht ways with Kirin's trip, speed there today was normal, but on way home was about 4-5MPH less than usual. I saw about the same power consumptions at the lower speeds though, due to the load on the way back, and possibly because of the different leftside motor (4t vs 3t)
unknown start voltage (forgot to note it, wasn't fully charged, but had cleared stats to get them for just this trip)
53.6v end voltage
(forgot to note triptime)
Present odometer is 2881 miles total on the trike.