Land rover aftermarket is quite small. However, most of the companies will do custom work.
Tactical 4x4 is the only US solution for full steel bumper and tire swing out, but, to be honest, I cannot see a reason for a ladder attached to the swing out. They may do it if you request it though.
OEM Bumper-mounted swing outs as just as good, but (I have one installed) I could not see a good way to mount it to the swing out---all are passenger side biased.
All LR4 ladders (prospeed, frontrunner, Gobi, terrafirma) mount to the clamshell upper door. When open, the ladder is up, out of the way anyway.