What Apis said.
My truck is a K3500 with a steel flat bed.. yes, I love it, no you will never overload it with hives unless you can stack them 5 or 6 high. (Provided it has the 9 foot flatbed?)
The height of the bed can be annoying when you need to reach something in the middle... I made 3x6 treated boards to drop into the stake pockets to keep things from sliding off the sides.
I have been looking for a small truck thats 4 wheel drive so it would be easier to get out into the outyards, easier to reach stuff etc... Unfortunately, around here, beat up rusted out toyotas that no longer run or drive have price tags over 2K.. Chevy S10's in worse condition still fetch over a grand..... Had to settle for a ford ranger thats rusted out badly, has a busted leaf and other minor problems, but it at least starts and runs wonderfully, the AC works, Heat works, Wipers work, AND, the 4 wheel drive works... cost me 500 bucks.... going to rip the rotted out bed off and make a flat bed, put some digger tires on it and use it to run about checking/caring for hives.