Keith,
I never like to tell anyone to "wait till it breaks". The noise may have been caused by the road surface that you were driving on at the time, or from a slightly cupped front tire. It is impossible to tell from here what your noise could have been, especially with only 15 miles each way on the same road, within the last 9 months.
You could have a bearing failure, with full hub oil levels, although it is not likely. The most likely cause for your noise, is the road surface itself, or a tire with an abnormal wear pattern (cupping).
If you have a bad bearing, it can cause substantial damage when it totally fails, including a tow charge, so you should be very conscious of the noise until you determine what the root cause is. You can jack up the front wheel in question and turn the wheel by hand to determine if you have rough bearings, and check for uneven tire wear, however there is a safety issue here so exercise extreme caution, if you try this.
The best thing is to use the coach, and get out and drive it like the builders at Beaver intended. Then you can answer the question yourself with the changes in road conditions, as well as noise level changes as you drive.
Gerald
