This is such a tough question to answer... In a word you will very likely be over GCVW. Axle for axle youll be ok if loaded properly. My opinion on 3. 73's vs. 4:10's I wouldn't change, youve got the ability to drop a gear if needed. If you tow 100% of the time then maybe change the ring and pinion. Legal issues who really knows I've heard lots of thoughts on the matter but not any hard facts. IMHO the bottom line is all about your comfort level and how safely you operate your rig. The most perfectly weight matched rig/truck combo(heavy) is a deadly weapon in the wrong hands and you can only anticipate and try to avoid the other "idiots" that you may encounter out there on the road. Drive safe and enjoy.