Local Delivery of weight based product

[ShawnBouchard]

Starting up a bulk Gravel yard, we'll be selling a bunch of products by the skidsteer bucket. 

Two issues:

1) I want to charge, say, $50 for the gravel, and charge a $10 loading fee. I don't want to create a product with the $10 baked in, because if someone wants to buy 4 buckets of gravel, I don't want to charge them 4 loading fees. So I think the best solution is to create a "loading fee" product, and create the "3/4 Crush gravel" product with variants for how many buckets they need. Then use the "bundle" app to bundle 1 loading fee with the variants of the gravel product. Does this make sense as the best solution to everyone here? This bundle app would work great for online, then for in-store we would just manually add the loading fee and the gravel separately. 

2) For offering delivery of the product online, I currently offer local delivery for $10 for all our smaller products, like trees and shrubs, but for a trailer full of gravel, delivery is $100+. Hoe do I set up weight based delivery? Is there an app that will offer that for us.

[ShawnBouchard]

Appreciate it. I saw your app while researching. 29.99 usd every 30 days is too much for me to consider