Yes Beelab you have the right idea. Simply break down each hive into manageable piece sizes and move them that way. Reassemble at the vehicle or at the new location. The bees will be fine. Just know which box of bees goes with which box of bees. For example. Take the hive apart, carry the parts to the truck, put the hive together on the truck, drive, take the hive apart off of the truck, carry pieces to the new site, put the hive together, go home.
A couple of helpful notes. Get everything ready ahead of time so you can efficiently Move at dusk, finishing in the dark. The bees wake up in the new spot in the morning and carryon like nothing happened. Evening move gives you more time and flexibility to deal with the unexpected without rushing against sunrise and bees getting active. Have a good smoker and lots of fuel. Use smoke to calm them and light puffs to push them back into the boxes.
For working in the dark use RED lights. Beit lantern, flashlight, whatever. Just bee red. Bees cannot see red. You will comfortably see what you are doing but to them it is still a pitch black night.
If the terrain is challenging, moving by hand and foot, and there are only two hives it might be worth considering to cage the queen in the hive to protect her from being squished from shifting that can occur when someone stumbles in the mud. Rarely necessary but gives that 100 percent confidence if one needs that.
A basic garden cart or wheel barrow works well for moving the break-down hives quickly to-from vehicle access.
Do not over complicate it. Keep it simple. Just plan it out ahead so it goes efficiently and smoothly. Bingo bango bongo - doneso.
Hope that helps!