Florida allows this "fence" to be a screen enclosure. I suppose, once they get the bus away from the service drops, they can just string screening over the roof ribs. If the ladder was folded up with a latch 53" high , they could even argue the access was more than 53" above ground and compliant. The other open question would be bonding and GFCI protection. The pump would require a twist lock plug if it was within 5' of the "above ground pool". I friendly electrical inspector could help them make this compliant fairly easily. I suppose there is some local pressure making this difficult.