A scale vehicle is usually classified as kind of a trail/crawler. The main reason for this is because it uses straight axle housings like a crawler, because it's a scaled down version of a real vehicle. Where a crawler has certain modifications done to make it a crawler, such as chassis design, big shocks with external springs, link bars, things like that which are there for the main reason of making it a better crawler, a scale truck has one main objective, and that is to make it as realistic as possible. It will have a chassis that looks similar to a real truck chassis, suspension that looks as realistic as possible, and all of the electronics, servos, things like that are completely hidden. You can take a picture of a good scaler and most people will think it's a picture of a full size truck. Scalers usually have one level or another of custom work, from things in like back of the truck like Rolex's truckling project, to scaled down "Rancho" decals on the suspension. So basically with a scaler it's all about the details, and people often use hard plastic bodies because they look so much more realistic than the lexan bodies. Scalers can be cars, trucks, campers, anything that is built as realistic as possible so that it's hard to tell it's an RC and not a full size vehicle. You can go to the scaler section of rccrawlers.com and see some projects. NCNitro is building a scaler jeep tubar in the projects section, and take a look at the details such as the scale wheels and locking hubs, the interior, and the bungee cords and fire extenguisher.
Here's a link to a really nice scaler kit where you can see the intricate details.
http://rc4wdstore.com/product_info.php?cPath=31&products_id=637
A popular place that many people start for scalers is the Hi-Lux and brusier chassis
http://www.tamiyausa.com/product/item.php?product-id=58397
http://www.tamiyausa.com/product/item.php?product-id=58372
Now of course you're chassis wont be scale, but that's just to give you an idea. The body on yours is what would give you the scaler project, and you could get another one or modify that one to make it look just like the SWAT vehicles, and use clay and styrene, things like that, to make all of the details.