Hypothetically speaking, let's say one who races triathlons is also raising money for LLS as part of a race. And this individual also has an RV that he or she could use to give rides to friends for a donation to LLS.
People have been using creative ideas to do this for years. Most likely not legal but people do it.
Example:
One guy around here auctioned a "Ride to the airport in his SUV with a certified pilot". Once there he offered to take the SUV ride winner for a ride in his airplane.