You won't hit 7000 lbs without trying really hard. 1000 lbs over dry is a good estimate for loaded weight.
5622 + 1000 = 6622. Let's round to 6700.
6700 * 13% = 871lbs TW
For choosing a WDH rating (800, 1000, 1200, etc), I like to add 100 lbs to est TW, to be sure you're not too close to the max. Being at the limit is a recipe for a bouncy or "porpoising" connection.
This means a 1000lb rated WDH kit will be just fine for you.
I use the 1000 lbs Equal-I-zer for my 5200 lbs trailer (~700 lbs TW), and it's fantastic. You have more TW than me, but I think the 1200 kit would still be too stiff for you.
As has been said, the Propride is a great hitch. But it's crazy expensive (like the Henseley), and weighs a lot more. If you are concerned about too much TW on the Expy, you do not want the Propride.
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