I know it’s overkill, but it’s for specific dimensions, so I’m trying to find the simplest solution. I may go for 2x4 for the cross bars, it’s probably fine, and I can double up on them if feel the need for more strength.

The only 8 foot pallets I ever see are made to be lifted from the long end, and they can’t take a jack under the short end. Otherwise, that would be simpler, and I would just need to line something up under the feet to make sure they’re sully supported.