You got a '05 and question about warranties? Get real.
Your '05 has a 10" I-beam frame. Now they are 12"
I had a hitch welded up. a "H" pattern frame, bolted on with 8 1/2" bolts.
You should be able to tow a golf cart load with no issues.
This link takes you to a group of pics of the hitch I had made and have towed over 3500lbs behind my Montana.
http://s143.photobucket.com/user/jlb...?sort=3&page=1
DO NOT buy a "universal" hitch. Spend the money and get a good one built. BOLT IT ON, do NOT weld it on. A good hitch will cost around $500.
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2012 Ram Laramie 3500 DRW 4x4 3.73 Tow Max Pkg B&W Companion 60 gal RDS aux fuel tank. 2014 Montana 3150RL, 2 A/C's, Leather, 6 Point Jacks, Splendede WD2100XC, Mor/ryde X-Factor, Duravis 250 tires with TST 507RV monitors. 2 x Honda EU2000's