2013 Toyota RAV4EV (rare, 2600 made over 3yrs). Manual says no towing (since EV). Ok; motorcycle hitch carrier for WR250R planned. Here's a picture of hauling wood & original springs could use help leveling. Basket did scrape on a couple of low spots. Got Firestone Air Bags #4174 & I can't fit thru coils Local mechanic looked (at Mitchell's?) & said 4.5hr job with dealer recalibrate brakes. Dealer doesn't do suspension mods, liability. Can someone verify what R&R of rear springs job requires? This job would replace original springs but with air bags inside. Going to Russian motorcycle manufacturer and car shop Tuesday. See if they can #1 install bags as instructions say or #2 by removing springs. Once on lift, extra weight on tire might open spring enough. Is there a tool that spreads coils wider while installed (spring not removed) & is there a risk of damaging spring?