This obstacle course is a good choice when the event has a high volume of participants. We can add a large slide to the end and make it 75' long. See our 75' obstacle course for more information. We can also add a pool to the large slide to make it a giant obstacle course with slide and pool. See our water attractions. Rock Rental charges 5% for credit card payments, no additional charge if paid by cash or check. Rock Rental's delivery fee is based on $2.00 per mile round trip without a trailer and the travel fee for 1 vehicle towing a trailer is $2.50 per mile one round trip from El Cajon with a zip code of 92021. If the location does not have a power source within 100 feet of the back of the unit, you will need to add a generator to your reservation.