I used a 10' UHaul that had 3? horizontal braces running on the outside walls.
You can loop tie downs behind them as a anchor point.
Perhaps not the best...but you won't have to take a 2 x 4...cut it into 10" pieces and screw them to the floor as anchor points.
Or..if you're going to be frequently transporting...you might consider these:
or the cheaper HD version: