I have the instructions for the trumpeter challenger 2 kit.
If you can provide me with an email address, I will scan the instructions for you when I get back to work on Monday.
Step 5 is Attaching Wheels
Step 6 is Rear panel assembly
TOW BAR
Parts C45 + C46
Parts C43 + C47(x2) ; Part C42 (x2) attach to C47 (x2)
REAR LIGHTS
C26 ; C27 + C18
FITTINGS (fitting parts into holes rising from bottom to top)
C50 (x2) + E9
Subassembly (towbar)
C16 (x2)
C48 (x2)
then finally fit rear light assembly
Step 7 is Jerry can assembly
E1 + E14 + E17 + E2 + E4
E13 + E11 fits to front of assembly (E1+E14+E17+E2+E4) refer to page 6 section 8 for a drawing of assembled unit
JERRY CANS
E18 + E19
E15 + E16 + E27
Place into subassembly (E1+E14+E17+E2+E4+E13+E11) and enclose with part E3
That is everything on that page. I hope that is of some use to you.