Jeez man... your battery may be good when sitting still but when you try to crank it, place it under load, many dead batteries will drop their voltage like a chevy drops engines......
whatever... some batteries will appear to be good but will actually be dead. Try this.. get a load tester. Hook it up and test the voltage. Now place the battery under the load feature and see if the volts drop. If it does then replace the battery (or try charging it first). Once it is charged then crank the tour.
Now with the tour running, place the voltmeter on the battery. If the battery is dropping in volts then it's not getting charged. If the volts is 13.5-14.5 then your system should be charging and the problem is elsewhere.
