Are you sure you only had 2k in the bed? Tacos are known for weak springs. But unless if you are buying bags or blocks from Lowe’s then are you sure it was only 2k?
I wonder if a dump trailer (or similar) is needed here. That or just taking more trips with less in the bed. Anything can be overloaded. Anyhow. to me it sounds undersized. But if only 4 trips a year, why not rent or have it delivered? I get it, I hate renting too, so I just take more trips instead. Then you can keep a right sized vehicle that you otherwise like.
I had 60bags of 60lb concrete mix. 3600 total, plus the weight of the trailer(450lb) tongue was probably 200.
issue with renting is it almost never works out in time. Tried it when I didn’t have a truck/cargo van. The inconvenience was enough to justify buying a Tacoma. Allows me to space out the work instead of renting a uhaul and doing all of it at once.
I’ve considered just getting a trailer for hauling heavy loads that exceed payload, but that doesn’t work out well because the 2.7 is only rated to tow 3500lbs. Any trailer that can handle weight is pushing 1k lbs, which leaves 2500 towing capacity.
my current trailer can handle 2000lbs, puts the total towing weight just under 2500lbs.