Speaking of hitching, it is a good idea to lube your fifth wheel hitch every time (every day) you hook up and pull. Lube using the manufacturer's recommended lubricant. Mine is WD-40. A well lubricated hitch seems to be more forgiving of being at just the right height. Keep in mind that the king pin is kind of like a sled that needs to ride up on and depress the hitch and bed with the weight of the front end of the trailer.
As for putting a trailer in for repairs, it seems many repair shops want your rig in their possession before they even troubleshoot it and order parts (or even get in line for them to troubleshoot it and order parts). Due to the fact that many or even most of the manufacturers are notorious about shipping the wrong parts, you can give up the use of your RV for some time. For this reason, I have started using mobile RV repair whenever possible, especially since we are full timing, even though we pay a premium for this option.