Check your owner's manual regarding the weight(s) at which you should use a WDH. AT 3600 lbs loaded, you need at least 360 lbs (10%) as tongue weight, and will probably have 400 or more.
a. If your manual says you need WDH, then get something that has built-in sway control. The Equal-I-zer 6000/600 would be perfect for this application.
b. If you don't need WDH, then try the rig without sway control either. With proper loading (more TW is better, but not more htan 15%), you could be fine. But every rig is different.
c. If you don't need WDH, but you find the trailer pulling you back and forth on the highway, double-check loading, and all 6 (8?) tire-pressures. if all is good, and still have sway, get a friction sway controller. Any hitch shop can set you up. Should not cost you more than $200 parts & labor, or about $75 if you install yourself.
thebrakeman ('70), DW ('71), DD ('99), DD ('01), DD ('05)
2004 Surveyor SV261T (UltraLite Bunkhouse Hybrid)
2006 Mercury Mountaineer V8 AWD Premier
Equal-i-zer WDH (10k), Prodigy Brake Controller