Can you name that sound (squeaking)?

I had a similar squeak on a previous RV. It droves us crazy and like yours it would start when driving at a slow speed and eventualy stop after things got warmed up. I swore it had to be in the suspension/drive works of the rig but it was not. After sitting overnight or even when we were stopped at a restaurant if it was cool outside, the tires develop a flat spot where it meets the ground. As you start driving it starts a bit of shaking in the motorhome. As the tire warms a bit from driving it warms and the flexing of the tire limbers up the tire and the flat spot goes away and so does the minor tremors traveling through the coach. One morning we headed out on another trip and that damned squeak started up. For some reason a thought occurred to me. We were still near home and on a slow speed road,right in the "squeak zone". I ask my wife to go to the entry door and open it up. Upon opening the door the squeak stopped instantly. It turned out the slight tremor caused by the stiff tire flat spots was causing the
door to move ever so slightly in its' opening and the aluminum of the door was rubbing against the aluminum of the door frame, causing the squeak. End of story and end of squeak.