strange 01 tacoma sounds

i have a 01 tacoma 2 wheel drive v6 wih 155k miles and it has been making some strange sounds and was wondering if anyone what they were and what to fix.

sound #1
1 out of 8 times when i start up my truck i hear a screeching/squeeling sound coming from the engine bay. a buddy of mine says that the alternator belt needs to be replaced from usual wear in tear over the years, would replacing the belt eliminate the sound?

sound #2
when driving going around residential roads when i hit pot holes or bumps in the road i can hear something rattling underneath the truck when my windows are down. it sounds like exhaust might be loose but ive gotten underneath the truck and shook everything i could find to imitate the problem but can't seem to find it. is there anything that generally breaks loose from this model and year truck that i can narrow down the prob?

let me know if anyone can help with these lame issues for an OCD tacoma driver, they are making me crazy! thanks

 

1) Replace all 3 belts.

2) You will have to get under the truck and start hanging/banging on things and see if something is loose.

 

easy to replace and how much are the belts going to run roughly?

 

my skid plate was rattling. you should check the bolts on it too..

 

About $60 if you get the higher quality ones. easy to replace, I would say yes, just a little time consuming, mainly the ac belt as you have to take the skid plate off to get at the tensioner.