By your post I assume your not interested in another dually right now? OK then at least get a 3500SRW truck. The cost difference is very little, but you do gain in weight capacity. Going full time I suspect you will quickly discover the trailer your interested in is simply too small and will end up upgrading to larger. So why limit yourself by the truck you buy today. Full timers soon find places others did not know even existed to put stuff so weight is always a critical part of your traveling equasion.