Changed the timing belt, tension idler, bearing idler, water pump, thermostat, belts and hoses today on my 1991 Winnebago Warrior 3.0 V6. I paid a friend $300.00 who is a GM mechanic to come and help me. The fact that I could find no signs of the job having been done before, neither through any type of label under the hood in the engine compartment, no handwritten notes from the previous owner in the owners manual and no record of it having been done in Toyota dealership service records, we went ahead and did the job. Once we got in the belt looked okay, no tears, chips or serious signs of wear, but we proceeded ahead since we were so far into it already and found that the water pump had started leaking out the weep hole in the bottom and would have needed to be changed soon. Once we completed the job, we did have some difficulty with air in the cooling system after the initial fill, but we think it is all out now. Only thing left is having my mechanic friend stop back by with a timing light just to check and see if we need to tweak it a bit. I might try to take it on a test run tomorrow to make sure no air is left in the system and no over heating problems.
Here is a breakdown of the cost and some things I found out along the way. Toyota water pump from dealer $115.62, Toyota timing belt $54.52, Toyota thermostat $26.58, had the tension and bearing idler from a Goodyear timing belt kit I bought some time ago and can't remember what I paid for those but the manufacturer of the of the idlers were GMB, I noticed Koyo brand bearings were on the ones that came off. Also replaced the A/C, power steering and alternator belts and all the hoses while we had it apart. The belts and hoses were another $125.00 and we used Gates brand.
From the research I did and the helpful information from the community here, it seems that the consensus of most is that Gates makes good belts and hoses. Also, I found some listings on Ebay that sold Aisin water pumps and read that they were the same manufacturer as the Toyota water pumps. When we took off the factory pump, sure enough it was an Aisin pump. I guess I might have been able to save some money by buying one of those timing belt kits online that have the Gates timing belt and the Aisin water pump, but I am just glad the job is done. Guess i'm good for another 6 years / 60,000 miles. Thanks again to all who responded, great community and great information.