Not sure what the law says in your state but I would think that as long as your registered with enough gross combined weight and you don't exceed any over axle weight you should be within the law. Check your axle rating sticker on the truck and make sure the rear axle is rated for more than your loading on it. Also check your tire weight ratings, make sure your not exceeding those limits. You also have to use common sense if I doesn't feel safe don't risk it. Make sure your truck and trailer brakes are working well, stopping is the most important thing. I pull a Fecon FTX 140 with a Dodge 3500 dually on a gooseneck deck over trailer and it has worked well with no problems. Make sure you have break away emergency brakes and they work. You also need all the things to drive a CDL commercial truck, like a triangle kit, DOT number, proper signage, fire extinguisher and log book if you go further than 100 miles (as the crow flies) from home base.Gooseneck trailers distribute the load well, they require more tongue weight than a tag trailer. I think your tongue weight should be about 20% of the weight of the trailer loaded. Check with your trailer manufacturer on that.