2000 Excursion spring and tire advice

[mrc]

I have a 2000 Excursion that I have owned for almost a year. It primarily sits in the garage and only comes out when it is nice. The previous owner has done some suspension mods but I am having trouble trying to figure it all out. The part # on the front springs are 3C34 AFA 3503. There is also a couple of little short springs under the main leaf that I am not sure about. Anybody have any input on them front springs? Truck doesnt ride to bad at all but the rear does sag easy with the weight of a small tailer on the hitch. I have searched multiple places and I come up empty handed on that part #. The rear springs are look to be factory but am not sure if the block is factory or has been added.

The wheels I like OK but the tires do rub slightly on the springs when I am at full lock in either direction. They are LT305/55R20 Load E Nitto Dura Grappler Highway tread tires. I would prefer something a little more narrow. I dont mind the height of the tires but a little to wide for my likings. I am sure they do not help my mileage any being that wide also. What would you all recommend for a tire size?

I may have to bite the bullet and and go with the "V" codes up front and the modified "B" in the rear. Thanks for any help or suggestions.

[copracr]

THe V's up front will leave you sitting right around where your at (in your signature pic). Thats what I'm running on my V10 which is a few 100 lbs lighter.

Also, those little springs appear to be some kind of lift