A trunk rack attaches to the rear of a vehicle, while a roof rack is mounted on the roof. Trunk racks are easier to install and remove, but can obstruct rear visibility. Roof racks offer more space and versatility, but may affect aerodynamics and fuel efficiency.
Evaluate differences between 2 (or more) items
don't know
When comparing two items or two objects, then look for the similarities (what is the same) and differences (what is different) between them.
The space shuttle is useful because it was the first reusable spacecraft. It is also capable of carrying satellites and other items into space. It is capable of repairing damaged items in space as well.
Carrying heavy items can indeed cause an increase in a car's center of gravity. This is particularly true for SUVs, which typically have a higher center of gravity to begin with. To keep the center of gravity as low as possible, load heavy items as low in the chassis as possible, and towards the center of the vehicle. Heavy items should never be carried on a roof or luggage rack.
Your vehicle
The price for the Megellan Roadmate varies by vendors but the price range I have seen is between $315 and $335. You should always price check items items between Amazon and Ebay for pricing differences.
The price for the Garmin Marine varies by vendors but the price range I have seen is between $392 and $504. You should always price check items items between Amazon and Ebay for pricing differences.
The two items being compared in a phrase are typically the subjects or entities that are being analyzed or contrasted. For example, if the phrase is "like apples and oranges," the comparison is between apples and oranges to highlight their differences. In such comparisons, the aim is to illustrate similarities or differences in specific characteristics or qualities of the items.
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In order to make a comparison we have to have two items. We could note similarities and differences between Flowers for Algernon and some other work of fiction, but you have not stated any.
If they have to be in the same compartment as the driver you can protect them yourself prior to transport if you are concerned about contamination.