I have a 2001 Popular 190 on a Dodge chassis. The front wheel bearing set-up consists of an inner and outer bearing, a bearing race that is pressed into the brake rotor and a seal against the inner bearing which prevents water from coming into the bearing.
Although your vehicle has only gone 50,000 miles, the rubber on the seal could be 18 years old if never replaced.
In order to replace the seal and bearing race, the brake rotor needs to come off. There are 4 bolts that hold on the front brake caliper and they are a bear to loosen because they are exposed (rust potential) and torqued to a very high value (over 100 lbs). they are not easily loosened and can easily have the corners rounded off. In addition, these bolts are not easily obtained from the dealer (they are discontinued), but my Dodge dealer was able to obtain them from an aftermarket company for $18 each! Luckily the bearings, races and seals are inexpensive. Also I installed new rotors and the race was already installed.
Do the service. there is nothing worse than traveling with your RV and hearing that low hum from the front wheels. It only gets worse.
Don't be tempted to just change the outer bearing because you don't feel like pulling the caliper and removing the brake rotor. If the seal is leaking, you will have water damage and that cannot be seen without removal of the caliper and brake rotor.
Once done, your good for quite a while and will have peace of mind.