What are the benefits of using mobile truck repair instead of towing to a shop?

Unexpected breakdowns can happen anywhere, and towing a heavy-duty truck to a repair shop isn't always the fastest or most cost-effective solution. I'm interested in hearing from truck drivers, owner-operators, and fleet managers who have used mobile truck repair services. What benefits have you experienced compared to towing your truck to a shop? Does on-site repair save enough time and money to make it the better option for most situations, or are there cases where a traditional repair shop is still the better choice? I'd love to hear real experiences and recommendations.