They are extremely helpful. We have always dealt with Aaron. I believe there is a weight capacity but the stinger is the most important in measurement for your setup. We had a Hensley Arrow with our TT, then when we bought our fifth wheel, we traded in the Hensley Arrow for their TrailerSaver BD3 fifth wheel hitch. Both are excellent products. I just sent an email to them asking about a cover for the BD3 and was immediately responded to - I ordered the cover and got an email the next day, it has been shipped. Their customer service is amazing.