You have a few good options, like www.haulmark.com or www.pedatarvcenter.com. Each of those options look very reputable!
There are multiple auto dealers in different parts of Ohio. You can visit used car lots of local chevy dealers to find a used chevy truck.
Yellowpages and Yelp are good sites to find new auto dealers in Houston. They have lists of the dealers and customer ratings to allow one to choose the best. Some the dealers are 'Fred Haas Toyota World', 'Paragon Auto Transport' and 'Lone Star Chevrolet'.
You can purchase a Wabash trailer at one of the national dealers. There are 16 of them in the nation that all go by the name Wabash National Trailer Center.
This website has the list of various Auto dealers within the Los Angeles area! http://www.dealerconnexion.com/chevrolet/california/los_angeles/ Try shopping around for the best deals!
Auto auctions are usually open to the public and you would have to find out what hours they are open to the public. They are a lot of dealers that go there but you can find the hours and be able to go also.
You have to specify where you are. However you can start by checking with the RV dealers near you to see if they carry that brand of camper trailer.
There are a number of places you can find information about car trailer spares. One great place is TrailerTrek and another is Auto and Trailer. You can also try Halfords.
Information on pickup car dealers can be found on Auto Trader, Car Guide, Pickup Truck, Leader Auto Sales, Lovett Pickups, USA Auto Dealers and The Car Dealer.
The Alabama Auto Dealers Association has a website that lists all of their members. I was not able to find any Auto Dealers with Ames as a part of the name listed as a member. You can visit them online at http://adaaweb.com/ in the future if you want to see if a dealership you are checking out is a member.
You can find automobile dealers especially truck dealers in Los Angeles area like Midway Sales & Leasing which provides truck renting and dealing serves.
Copart.com has listing of car auctions all across the country. You can also looking your local yellow pages as auto auctions are quite common. Beware some are open to dealers only.