You do have a lot of storage space up front and under the bed (assuming you have the 301blds) so I'm assuming you have a lot of gear stored there already. Are your propane tanks and batteries up on the tongue? If you only have one battery, you could add another - that's 75#.
If all else fails, you could put cases of beer in the front compartment
Before you start carrying around a lot of unnecessary things, I'd go out for that test tow and see how it does as is. But I'm betting you'll want 300# more in the front.