Some are low profile and wont accomadate a large Tulsa type windshield. I don't care for them because they tend to be expensive and don't adapt well to other uses and cargo. I'd rather stick to a small V-nose 5'x8" which will fit a wing because of the added v-nose length. Thule makes an aluminum one 5x8 that is tight but would work that only weighs 800 lbs. I have their 6.5x10 aluminum(1130lbs) and am very pleased.