Number of Labor Hours for a Towed vehicle install?

I just learned to get another opinion. I got to compare a mostly Pull Behind RV Shop at $100/hr versus a mostly Motorhome dealer at $135. I favored the latter since they did a lot more tow installations and even though they were more expensive/hour the total hours would be less. I was really pleased with the bottom line plus I had more cofidence in the quality of their work. Thanks to all for helping a guy out.