I've hauled all kinds of heavy cargo ( well, up to about 80 or 90 pounds ) with my Burley Nomad using both the plastic triangle style hitch they use and also the metal hitch that bolts to your rear axle. Never once an issue either way. I prefer the hitches that mount low like this to the kind that mount to the seatpost. My feeling is that I'd rather have whatever weight I'm hauling influence me at the lowest point possible on the bike. A certain amount of weight impacting the bike down low would seem to me to have less detrimental impact that up high on the seatpost. I'm no physics expert, just my gut feeling. Especially with the metal axle-mounted hitch, taking the trailer on and off is a snap...a few seconds. Plastic style, maybe 10-15 sec. The Burley trailer arm is set up (angled) such that it compensates for the hitch being to the left of center. I love the Nomad. You'd have a hard time selling me anything else. Now, if you hauled larger cargo a lot, it wouldn't work. You'd need something homemade or like the Burley flatbed. Either way, the Burley style of hitch has worked well for me as long as your rear axle is 10mm or less.