Caudwell said "find me somebody who'll work for free."
"And all the better if they can read maps, cook and are prepared to drive across Europe towing a trailer full of potatoes.
"We'll be going at race pace across five countries - and that takes its toll," said Caudwell, who set up the Caudwell Charity in 2000 and has raised £4m since.
"An absolutely crucial member of the team will be a masseur - he, or she, will be tasked with massaging out those aches and pains every night after we cover up to 200 miles a day.
"If passers-by could hear the screams when a good masseur goes to work they'd think it was somebody with a real talent for torture in action, but the agony of a session on the massage table turns into a real benefit once they've worked those muscles loose again," he said.
"We've been let down at the last minute by both a masseur and a driver, so we need both - fast. The job may suit somebody involved in sport who's out of season, possibly a student on a gap year - but they'll need energy, and they'll need to be resourceful and upbeat.
"If they can drive - and can commit to three weeks support - that's a bonus. If they can cook potatoes and warm up Mars Bars out of the back of a trailer on a Primus stove at the roadside, better still."
Tel: 01782 600869