I really , really believe that the T/S 500 ( or comparable 4 "pill" ) is a great Amp to run in a Mobile.
It is about as easy as it get`s for a plug and play set-up.
Plug and play as in a single hi output alt, factory batt and good cable to the amp like 6 gauge.
Waverider is correct in what he has said about going any bigger, you must increase your power output 4x to really see a difference on the other end, and the first bump that you do is the biggest increase that has a difference.
If you really want to go that big, because of the radio that you are running, IF you decide to go with a Texas star, I would chose the 1600, use 2 gauge wire and a 160 fuse at the battery.
Another good place to get cables, fuses and connectors is go to a place that sales and services forklifts, talk to the guy at the parts counter and tell him what you want to do, they deal with large capacity cables, fuses and connectors all the time because a lot of warehouses use electric forklifts.
You should see about 900 watts as has already been said.
I ran a sweet sixteen years ago and I never asked it to do more than that and it still worked good when I sold it.
You can drive it harder, and see bigger numbers, but if you want it to be reliable don`t do it.
Another Amp you should look at is the TnT 1500 amp built by the X force guys, you are going to pay about $700 bucks for the 16 and you must add fans to it if you want it to live very long.
The 1500 has B bias for SSB, and the case is built for better cooling because it forces the air across the heat sink and it has a fan already.
It will easily handle the full output of your radio.
73
Jeff