I love Rollergames. Underrated Konami classic.
Anyway, that's not even close to the last stage. But the way to get through it is reach the truck with enough health so that you can take some hits and then stay at the bottom left of the screen. Try to either jump the barrels or move right to get under them.
The game gets much harder after this. There's some really tricky platforming coming up.
My preferred character is Hot Flash because she's fast and good at jumping. I've beaten the game deathless with her. But she's the physically weakest of the three.