Help identify this LEGO-compatible fire truck set (no box, no instructions, no brand)

Hi everyone!

I bought this building block set at a flea market in Germany.

It came with no box, no instructions and no minifigures.

I can’t find any LEGO logo or brand name on the parts.

It seems to be a fire truck because it has two telescopic light-gray ladders.

Details:

• Red, black and light gray pieces only
• 4 red wheels
• No stickers
• No minifigures
• Around 300–500 pieces
• LEGO-compatible bricks